Which currency has the highest standard deviation of percentage change.

You should use the percentage change (NOT absolute value of the percentage change) to calculate the standard deviation.

DATE CAD1 2010-01-01 1.0438 2010-02-01 1.0572 2010-03-01 1.0229 2010-04-01 1.0052 2010-05-01 1.0403 2010-06-01 1.0376 2010-07-01 1.0422 2010-08-01 1.0404 2010-09-01 1.0330 2010-10-01 1.0179 2010-11-01 1.0129 2010-12-01 1.0081 2011-01-01 0.9939 2011-02-01 0.9876 2011-03-01 0.9766 2011-04-01 0.9580 2011-05-01 0.9680 2011-06-01 0.9766 2011-07-01 0.9553 2011-08-01 0.9817 2011-09-01 1.0025 2011-10-01 1.0198 2011-11-01 1.0248 2011-12-01 1.0235 2012-01-01 1.0130 2012-02-01 0.9967 2012-03-01 0.9938 2012-04-01 0.9928 2012-05-01 1.0097 2012-06-01 1.0280 2012-07-01 1.0142 2012-08-01 0.9924 2012-09-01 0.9783 2012-10-01 0.9872 2012-11-01 0.9970 2012-12-01 0.9898 2013-01-01 0.9921 2013-02-01 1.0052 JPY1 MXN1 THB1 SLR1 EUR1 CNY1 GBP1 INR1 SGD1 0.01100.0781 0.0303 0.0087 1.4266 0.1465 1.6158 0.0218 0.7161 0.0111 0.0773 0.0302 0.0087 1.3680 0.1464 1.5618 0.0216 0.7081 0.0110 0.0796 0.0308 0.0088 1.3570 0.1465 1.5058 0.0220 0.7146 0.0107 0.0817 0.0310 0.0088 1.3417 0.1465 1.5332 0.0225 0.7237 0.0109 0.0786 0.0309 0.0088 1.2563 0.1465 1.4669 0.0218 0.7174 0.0110 0.0787 0.0308 0.0088 1.2223 0.1467 1.4768 0.0215 0.7155 0.0114 0.0781 0.0310 0.0089 1.28110.1476 1.5304 0.0214 0.7270 0.0117 0.0783 0.0315 0.0089 1.2903 0.1473 1.5661 0.0215 0.7380 0.0119 0.0781 0.0325 0.0089 1.3103 0.1484 1.5591 0.0218 0.7500 0.0122 0.0804 0.0334 0.0090 1.3901 0.1500 1.5867 0.0225 0.7677 0.0121 0.0811 0.0335 0.0090 1.3654 0.1503 1.5961 0.0223 0.7700 0.0120 0.0807 0.0332 0.00901.3221 0.1504 1.5595 0.0222 0.7655 0.0121 0.0825 0.0327 0.00901.3371 0.1516 1.5782 0.0220 0.7774 0.01210.0829 0.0326 0.0090 1.3656 0.1521 1.6124 0.0220 0.7839 0.01220.0834 0.0330 0.0091 1.4020 0.1523 1.6159 0.0223 0.7888 0.0120 0.0854 0.0333 0.0091 1.4460 0.1532 1.6379 0.0226 0.8024 0.0123 0.0858 0.0331 0.0091 1.4335 0.1539 1.6332 0.0223 0.8073 0.0124 0.0847 0.0328 0.0091 1.4403 0.1544 1.6219 0.0223 0.8106 0.0126 0.0857 0.0333 0.0091 1.4275 0.1549 1.6158 0.0225 0.8225 0.0130 0.0817 0.0335 0.0091 1.4333 0.1562 1.6356 0.0221 0.8272 0.0130 0.0765 0.0328 0.0091 1.37470.1565 1.5771 0.0210 0.7976 0.0130 0.0744 0.0324 0.0091 1.3732 0.1570 1.5768 0.0203 0.7839 0.0129 0.0730 0.0323 0.0090 1.3558 0.1573 1.5806 0.0197 0.7760 0.0129 0.0726 0.0321 0.0088 1.3155 0.1575 1.5587 0.0191 0.7720 0.01300.0747 0.0317 0.0088 1.2910 0.1583 1.5524 0.0196 0.7827 0.0127 0.0782 0.0326 0.0085 1.3238 0.1587 1.5804 0.0203 0.7978 0.01210.0784 0.0326 0.0080 1.3208 0.1584 1.5824 0.0199 0.7943 0.0123 0.0766 0.0324 0.0078 1.3160 0.1586 1.6000 0.0193 0.7994 0.0126 0.0734 0.0320 0.0078 1.2806 0.1581 1.5924 0.0184 0.7924 0.0126 0.0718 0.0316 0.0076 1.2541 0.1572 1.5556 0.0179 0.7822 0.01270.0748 0.0316 0.0075 1.2278 0.1569 1.5593 0.0180 0.7935 0.0127 0.0759 0.0319 0.0076 1.2406 0.1573 1.5722 0.0180 0.8013 0.0128 0.0774 0.0323 0.0076 1.2885 0.1582 1.6126 0.0184 0.8128 0.01270.0775 0.0326 0.0077 1.2974 0.1597 1.6080 0.0188 0.8172 0.0123 0.0765 0.0326 0.0077 1.2837 0.1604 1.5968 0.0183 0.8175 0.0119 0.0777 0.0327 0.0078 1.3119 0.1604 1.6145 0.0183 0.8194 0.01120.0788 0.0333 0.0079 1.3304 0.1607 1.5965 0.0184 0.8142 0.0107 0.0787 0.0335 0.0079 1.3412 0.1604 1.5563 0.0186 0.8076 DATE CAD1 2010-01-01 1.0438 2010-02-01 1.0572 2010-03-01 1.0229 2010-04-01 1.0052 2010-05-01 1.0403 2010-06-01 1.0376 2010-07-01 1.0422 2010-08-01 1.0404 2010-09-01 1.0330 2010-10-01 1.0179 2010-11-01 1.0129 2010-12-01 1.0081 2011-01-01 0.9939 2011-02-01 0.9876 2011-03-01 0.9766 2011-04-01 0.9580 2011-05-01 0.9680 2011-06-01 0.9766 2011-07-01 0.9553 2011-08-01 0.9817 2011-09-01 1.0025 2011-10-01 1.0198 2011-11-01 1.0248 2011-12-01 1.0235 2012-01-01 1.0130 2012-02-01 0.9967 2012-03-01 0.9938 2012-04-01 0.9928 2012-05-01 1.0097 2012-06-01 1.0280 2012-07-01 1.0142 2012-08-01 0.9924 2012-09-01 0.9783 2012-10-01 0.9872 2012-11-01 0.9970 2012-12-01 0.9898 2013-01-01 0.9921 2013-02-01 1.0052 JPY1 MXN1 THB1 SLR1 EUR1 CNY1 GBP1 INR1 SGD1 0.01100.0781 0.0303 0.0087 1.4266 0.1465 1.6158 0.0218 0.7161 0.0111 0.0773 0.0302 0.0087 1.3680 0.1464 1.5618 0.0216 0.7081 0.0110 0.0796 0.0308 0.0088 1.3570 0.1465 1.5058 0.0220 0.7146 0.0107 0.0817 0.0310 0.0088 1.3417 0.1465 1.5332 0.0225 0.7237 0.0109 0.0786 0.0309 0.0088 1.2563 0.1465 1.4669 0.0218 0.7174 0.0110 0.0787 0.0308 0.0088 1.2223 0.1467 1.4768 0.0215 0.7155 0.0114 0.0781 0.0310 0.0089 1.28110.1476 1.5304 0.0214 0.7270 0.0117 0.0783 0.0315 0.0089 1.2903 0.1473 1.5661 0.0215 0.7380 0.0119 0.0781 0.0325 0.0089 1.3103 0.1484 1.5591 0.0218 0.7500 0.0122 0.0804 0.0334 0.0090 1.3901 0.1500 1.5867 0.0225 0.7677 0.0121 0.0811 0.0335 0.0090 1.3654 0.1503 1.5961 0.0223 0.7700 0.0120 0.0807 0.0332 0.00901.3221 0.1504 1.5595 0.0222 0.7655 0.0121 0.0825 0.0327 0.00901.3371 0.1516 1.5782 0.0220 0.7774 0.01210.0829 0.0326 0.0090 1.3656 0.1521 1.6124 0.0220 0.7839 0.01220.0834 0.0330 0.0091 1.4020 0.1523 1.6159 0.0223 0.7888 0.0120 0.0854 0.0333 0.0091 1.4460 0.1532 1.6379 0.0226 0.8024 0.0123 0.0858 0.0331 0.0091 1.4335 0.1539 1.6332 0.0223 0.8073 0.0124 0.0847 0.0328 0.0091 1.4403 0.1544 1.6219 0.0223 0.8106 0.0126 0.0857 0.0333 0.0091 1.4275 0.1549 1.6158 0.0225 0.8225 0.0130 0.0817 0.0335 0.0091 1.4333 0.1562 1.6356 0.0221 0.8272 0.0130 0.0765 0.0328 0.0091 1.37470.1565 1.5771 0.0210 0.7976 0.0130 0.0744 0.0324 0.0091 1.3732 0.1570 1.5768 0.0203 0.7839 0.0129 0.0730 0.0323 0.0090 1.3558 0.1573 1.5806 0.0197 0.7760 0.0129 0.0726 0.0321 0.0088 1.3155 0.1575 1.5587 0.0191 0.7720 0.01300.0747 0.0317 0.0088 1.2910 0.1583 1.5524 0.0196 0.7827 0.0127 0.0782 0.0326 0.0085 1.3238 0.1587 1.5804 0.0203 0.7978 0.01210.0784 0.0326 0.0080 1.3208 0.1584 1.5824 0.0199 0.7943 0.0123 0.0766 0.0324 0.0078 1.3160 0.1586 1.6000 0.0193 0.7994 0.0126 0.0734 0.0320 0.0078 1.2806 0.1581 1.5924 0.0184 0.7924 0.0126 0.0718 0.0316 0.0076 1.2541 0.1572 1.5556 0.0179 0.7822 0.01270.0748 0.0316 0.0075 1.2278 0.1569 1.5593 0.0180 0.7935 0.0127 0.0759 0.0319 0.0076 1.2406 0.1573 1.5722 0.0180 0.8013 0.0128 0.0774 0.0323 0.0076 1.2885 0.1582 1.6126 0.0184 0.8128 0.01270.0775 0.0326 0.0077 1.2974 0.1597 1.6080 0.0188 0.8172 0.0123 0.0765 0.0326 0.0077 1.2837 0.1604 1.5968 0.0183 0.8175 0.0119 0.0777 0.0327 0.0078 1.3119 0.1604 1.6145 0.0183 0.8194 0.01120.0788 0.0333 0.0079 1.3304 0.1607 1.5965 0.0184 0.8142 0.0107 0.0787 0.0335 0.0079 1.3412 0.1604 1.5563 0.0186 0.8076