| Year | Value | | 2022 | 182.72193800067 | | 2021 | 163.63319698828 | | 2020 | 152.58458153314 | | 2019 | 149.75369875887 | | 2018 | 145.71326739935 | | 2017 | 141.14303395638 | | 2016 | 136.62315635063 | | 2015 | 132.88256798726 | | 2014 | 128.93455116378 | | 2013 | 123.49786268465 | | 2012 | 116.63438728383 | | 2011 | 108.45987233409 | | 2010 | 100 | | 2009 | 93.50261843868 | | 2008 | 86.55462184874 | | 2007 | 76.799415418341 | | 2006 | 71.720862257947 | | 2005 | 64.291803677993 | | 2004 | 59.194982340762 | | 2003 | 55.350500607239 | | 2002 | 50.69195892724 | | 2001 | 46.92274986 | | 2000 | 44.034509775931 | | 1999 | 40.546876238122 | | 1998 | 37.630757388763 | | 1997 | 35.280577474796 | | 1996 | 32.450882797837 | | 1995 | 29.478597638348 | | 1994 | 26.674435332064 | | 1993 | 24.130387628851 | | 1992 | 21.105762335817 | | 1991 | 18.168370598691 | | 1990 | 16.255865417712 | | 1989 | 14.592817434251 | | 1988 | 13.078929424565 | | 1987 | 12.070813739746 | | 1986 | 10.993261515411 | | 1985 | 9.9937182428345 | | 1984 | 9.2453466502773 | | 1983 | 8.514977123529 | | 1982 | 7.7074558861992 | | 1981 | 6.9350815392587 | | 1980 | 5.9565396163637 | | 1979 | 5.2419365411354 | | 1978 | 4.6913490022542 | | 1977 | 4.3022536837461 | | 1976 | 3.8016278005374 | | 1975 | 3.402439218255 | | 1974 | 3.0385770591977 |
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