I need help understanding how the column for TRY/USD xch rate change(%) was calculated. Thank you!

\begin{tabular}{|r|r|r|r|r|r|} \hline Year & Inf_TK(\%) & Inf_US(\%) & Inf_TK(\%)-Inf_US(\%) & S(TL/\$)-EOY rate & TRY/USD xch rate change(\%) \\ \hline 1989 & & & & 0.0023 & \\ \hline 1990 & 60.3127 & 5.398 & 54.9147 & 0.0029 & 26.6406 \\ \hline 1991 & 65.9694 & 4.235 & 61.7344 & 0.0051 & 73.372 \\ \hline 1992 & 70.0728 & 3.0288 & 67.044 & 0.0086 & 68.5938 \\ \hline 1993 & 66.0971 & 2.9517 & 63.1454 & 0.0145 & 68.9838 \\ \hline 1994 & 106.263 & 2.6074 & 103.6556 & 0.0387 & 167.5833 \\ \hline 1995 & 88.1077 & 2.8054 & 85.3023 & 0.0597 & 54.0309 \\ \hline 1996 & 80.3469 & 2.9312 & 77.4157 & 0.1078 & 80.679 \\ \hline 1997 & 85.7332 & 2.3377 & 83.3955 & 0.2056 & 90.7724 \\ \hline 1998 & 84.6413 & 1.5523 & 83.089 & 0.3145 & 52.9457 \\ \hline 1999 & 64.8675 & 2.188 & 62.6795 & 0.5414 & 72.166 \\ \hline 2000 & 54.9154 & 3.3769 & 51.5385 & 0.6734 & 24.3785 \\ \hline 2001 & 54.4002 & 2.8262 & 51.574 & 1.4501 & 115.3493 \\ \hline 2002 & 44.9641 & 1.586 & 43.3781 & 1.6437 & 13.3485 \\ \hline 2003 & 25.2964 & 2.2701 & 23.0263 & 1.3966 & -15.0307 \\ \hline 2004 & 10.5842 & 2.6772 & 7.907 & 1.3395 & -4.0912 \\ \hline 2005 & 10.1384 & 3.3928 & 6.7456 & 1.3451 & 0.4143 \\ \hline 2006 & 10.511 & 3.2259 & 7.2851 & 1.409 & 4.7545 \\ \hline 2007 & 8.7562 & 2.8527 & 5.9035 & 1.1708 & -16.9056 \\ \hline 2008 & 10.4441 & 3.8391 & 6.605 & 1.5255 & 30.2913 \\ \hline 2009 & 6.251 & -0.3555 & 6.6065 & 1.4909 & -2.2649 \\ \hline \end{tabular}