While calculating 90/10 ratio for Afghanistan in the year 1980. Should we take Decile 9 or Decile 10?

GCIPrawdata - Protected View Search Sushanka Amgain File Page Layout Formulas PROTECTED VIEW Be careful-files from the Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Enable Editing 1443 H M N P R T U V W Source: Global Consumption and Income Project. All incomes expressed in 2005 USD PPP. Decile 1 In Decile 2 In Decile 3 In Decile 4 In Decile 5 In Decile 6 In Decile 7 In Decile 8 In Decile 9 In Decile 10 In Mean Inco Population 1030 13211412 5 Afghanista 361 469 686 818 986 3655 1063 12996923 221 490 599 716 854 1278 1717 814 238 405 527 644 919 1107 1376 4105 1194 12279095 249 424 551 574 806 961 1438 4291 1248 11912510 1985 256 435 566 692 828 987 1189 1477 1984 1282 11630498 1986 268 457 594 726 869 1036 1248 1551 2083 4626 11 Afghanista 243 414 539 659 788 939 12 Afghanista 223 380 603 722 860 1730 1118 11375768 13 Afghanista 989 202 344 654 779 939 1567 1013 11608351 990 186 316 411 503 601 717 863 931 12067570 15 Afghanista 158 269 349 511 609 733 911 16 Afghanista 1992 152 258 335 410 491 585 705 876 1176 17 Afghanista 1993 99 169 219 268 321 383 461 573 769 1709 497 14824371 18 Afghanista 1994 70 118 154 188 225 268 323 402 539 1198 348 15869967 19 Afghanista 96 20 Afghanista 90 198 290 346 416 695 1997 85 145 189 231 276 329 396 661 22 Afghanista 140 222 266 317 382 1416 23 Afghanista 134 175 214 256 305 367 456 613 24 Afghanista 2000 75 127 165 202 242 288 347 431 579 374 19701940 25 Afghanista 68 116 150 184 220 262 316 392 527 1170 340 20531160 26 Afghanista 94 161 209 255 305 364 438 545 732 27 Afghanista 98 166 216 264 316 564 758 1683 490 22507368 28 Afghanista 004 95 161 209 256 306 365 439 546 733 629 29 Afghanista 101 172 224 274 328 390 470 585 785 507 24399948 30 Afghanista 104 176 229 280 335 399 481 598 31 Afghanista 115 253 310 371 533 662 889 574 25877544 32 Afghanista 2008 116 256 313 375 447 538 669 898 1996 580 26528741 33 Afghanista 233 302 370 527 635 789 1060 2355 34 Afghanista