Year Index 1980 0.183 1981 0.228 1982 0.27 1983 0.324 1984 0.365 1985 0.38 1986 0.471 1987 0.601 1988 0.775 1989 0.91 1990 0.992 1991 1.192 1992 1.483 1993 1.817 1994 2.45 1995 3.658 1996 4.533 1997 5.283 1998 6.258 1999 7.525 2000 8.45 2001 9.425 2002 10.917 2003 12.617 2004 14.55 2005 16.042 2006 17.967 2007 21.275 2008 26.658 2009 29.542 2010 33.175 2011 40.317 2012 52.642 2013 70.908 2014 81.942 2015 91.708 2016 100.008 2017 109.65 2018 143.823 2019 197.286 2020 258.445 2021 333.393 2022 423.41 2023 531.379 2024 664.224