Year | Value | 2021 | 574.62367176058 | 2020 | 519.13345558793 | 2019 | 553.83923810959 | 2018 | 577.67358254169 | 2017 | 512.33672353809 | 2016 | 496.20099263832 | 2015 | 489.90194015131 | 2014 | 560.84345215938 | 2013 | 547.62087199869 | 2012 | 530.46189007487 | 2011 | 530.58206749057 | 2010 | 492.375514128 | 2009 | 477.09019494947 | 2008 | 492.44110853614 | 2007 | 400.69881711885 | 2006 | 346.97611563155 | 2005 | 334.34804117999 | 2004 | 294.29069711413 | 2003 | 269.94093063847 | 2002 | 229.390808258 | 2001 | 207.43628588729 | 2000 | 193.35646993176 | 1999 | 227.38764447454 | 1998 | 244.02508810866 | 1997 | 206.77798086478 | 1996 | 225.47440025285 | 1995 | 222.67009969971 | 1994 | 192.3740755158 | 1993 | 312.60364745289 | 1992 | 361.72414967374 | 1991 | 358.4518646483 | 1990 | 390.00259154176 | 1989 | 249.90099899089 | 1988 | 261.79648976796 | 1987 | 262.3177144346 | 1986 | 236.7954999857 | 1985 | 182.03432704069 | 1984 | 179.58891572592 | 1983 | 235.48626171986 | 1982 | 269.89882528785 | 1981 | 302.86304556727 | 1980 | 370.35343616724 | 1979 | 317.70250051312 | 1978 | 282.08678392942 | 1977 | 217.28338783927 | 1976 | 184.496540402 | 1975 | 184.75828923855 | 1974 | 188.68228996281 | 1973 | 176.37592203295 | 1972 | 144.87872470011 | 1971 | 139.45081150011 |
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