Year % 1979 -12.59581209144206 1980 -10.377503706210637 1981 3.8800529264852255 1982 -0.590170570662764 1983 5.06341605665315 1984 6.357181308121348 1985 11.309930461088125 1986 13.417341477803657 1987 6.3396843568695616 1988 8.089022702525712 1989 5.71772754999779 1990 -2.267652316414263 1991 11.41807150148138 1992 23.90090401372037 1993 6.146590625276879 1994 2.393764297034604 1995 10.557217983402605 1996 13.688940594777133 1997 19.570391013717433 1998 19.552812015264642 1999 12.212939847886615 2000 3.9777949957940715 2001 12.522837509476343 2002 18.639567641455237 2003 0.6228405126356749 2004 0.3933308949317594 2005 -3.721501933857827 2006 9.032103071484842 2007 -0.8885444319091935 2008 -9.172622797540772 2009 54.67772820521855 2010 -3.0610609464240626 2011 -6.705743095123385 2012 7.3383405122273695 2013 5.750972904142538 2014 8.493869808313391 2015 18.534879090394803 2016 9.814290588959693 2017 0.7266545123833269 2018 6.239045992884364 2019 13.579989646974722 2020 10.754688393210657 2021 -9.787161632905931 2022 -11.029253499744968 2023 17.3145628952111