| Year | Value | | 2024 | 196.28792874373 | | 2023 | 184.11932436903 | | 2022 | 164.78080631413 | | 2021 | 149.55976319987 | | 2020 | 144.50908739573 | | 2019 | 140.94784969246 | | 2018 | 136.15121603697 | | 2017 | 131.87763000675 | | 2016 | 126.42333145779 | | 2015 | 117.58837560265 | | 2014 | 111.99977588794 | | 2013 | 108.84454887736 | | 2012 | 106.69256805571 | | 2011 | 103.41503344776 | | 2010 | 100 | | 2009 | 97.778470912573 | | 2008 | 93.835037858537 | | 2007 | 87.69885020253 | | 2006 | 83.091914667365 | | 2005 | 79.671288725872 | | 2004 | 75.840566811093 | | 2003 | 71.61254763641 | | 2002 | 66.846531252042 | | 2001 | 62.854333668402 | | 2000 | 58.217021374848 | | 1999 | 53.299918326456 | | 1998 | 48.072648910138 | | 1997 | 40.507138738649 | | 1996 | 34.191889351681 | | 1995 | 28.305112256227 | | 1994 | 23.413592891012 | | 1993 | 19.059266735769 | | 1992 | 15.565893709131 | | 1991 | 12.255583743648 | | 1990 | 9.3993316998625 | | 1989 | 7.2777269494199 | | 1988 | 5.7820518952266 | | 1987 | 4.5134058591468 | | 1986 | 3.6604473738437 | | 1985 | 3.0800837314163 | | 1984 | 2.4821334542402 | | 1983 | 2.1367931296369 | | 1982 | 1.7866564084549 | | 1981 | 1.4325226519475 | | 1980 | 1.1239547774671 | | 1979 | 0.88813213274874 | | 1978 | 0.71546199335305 | | 1977 | 0.60754313905127 | | 1976 | 0.45405855161124 | | 1975 | 0.37891505484194 |
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