Year % 1981 8.778220753615944 1982 9.657107611466602 1983 5.582384314909088 1984 -3.589612088084202 1985 0.4278234903405266 1986 2.410327061724471 1987 -27.541172560831754 1988 -6.93663234888921 1989 -54.6984164302584 1990 -15.145686150901005 1991 -43.05818134357813 1992 15.621419725908574 1993 2.062071715139015 1994 1.5341848493305323 1995 6.113205866979443 1996 13.338474213030235 1997 15.3789556135872 1998 13.399431628638439 1999 5.303299611373268 2000 10.053495341816731 2001 16.631978195582143 2002 13.356475515032399 2003 9.810426511087075 2004 7.2736235338284745 2005 6.418515760862572 2006 -58.32717429933373 2007 5.9142068122849425 2008 4.589259232204436 2009 13.235671995272561 2010 10.16564259674123 2011 11.758776416036357 2012 8.721191672939193 2013 14.11241913364063 2014 15.260022323100959 2015 9.54233962133676 2016 11.994095990691273 2017 10.666044409609952 2018 16.359877410223362 2019 7.301759348174552 2020 48.52033122166536 2021 -11.101562441680043 2022 -3.1892909105400924 2023 26.398262123389145