| Year | Value | | 2024 | 126.02197774597 | | 2023 | 124.44483471625 | | 2022 | 120.78780398641 | | 2021 | 115.04118006089 | | 2020 | 112.44981274436 | | 2019 | 115.38084981398 | | 2018 | 116.15518806629 | | 2017 | 115.85880342489 | | 2016 | 115.40310091318 | | 2015 | 112.39475230076 | | 2014 | 110.39215337238 | | 2013 | 106.81417662033 | | 2012 | 103.48007191555 | | 2011 | 101.13836623529 | | 2010 | 100 | | 2009 | 102.4855374156 | | 2008 | 107.72447828619 | | 2007 | 93.632631353185 | | 2006 | 82.308494821753 | | 2005 | 73.597620566805 | | 2004 | 67.635922938418 | | 2003 | 63.329909210972 | | 2002 | 61.927520235176 | | 2001 | 61.779250035092 | | 2000 | 60.883450909583 | | 1999 | 59.894982909021 | | 1998 | 58.616152433295 | | 1997 | 56.93575683234 | | 1996 | 54.310138705849 | | 1995 | 51.771011529407 | | 1994 | 50.284343968596 | | 1993 | 49.62846122118 | | 1992 | 50.065716386124 | | 1991 | 48.579048825313 | | 1990 | 46.523949550075 | | 1989 | 45.168458538748 | | 1988 | 43.725516494431 | | 1987 | 41.801593768676 | | 1986 | 40.708455856316 | | 1985 | 40.402377240855 | | 1984 | 39.644155683695 | | 1983 | 39.210886222667 | | 1982 | 38.163818358877 | | 1981 | 36.105788418994 | | 1980 | 33.270907706176 | | 1979 | 31.1525353057 |
|