Year | Value | 2021 | 409.68537744249 | 2020 | 420.62856268921 | 2019 | 440.94320577195 | 2018 | 420.30860568392 | 2017 | 396.50327110176 | 2016 | 357.90523369492 | 2015 | 488.23930769896 | 2014 | 601.66008295155 | 2013 | 622.53244879813 | 2012 | 504.36283238375 | 2011 | 375.20075306257 | 2010 | 347.65994849217 | 2009 | 362.4160101105 | 2008 | 378.10130051951 | 2007 | 322.4512097104 | 2006 | 273.08185831258 | 2005 | 239.31831995502 | 2004 | 212.16895985028 | 2003 | 206.27701697445 | 2002 | 204.02060365169 | 2001 | 187.83678178545 | 2000 | 106.98098195474 | 1999 | 115.73109062125 | 1998 | 102.27078619982 | 1997 | 147.29416881085 | 1996 | 165.45524512196 | 1995 | 146.10612550914 | 1994 | 152.88346118924 | 1993 | 141.23830186578 | 1992 | 109.52565188974 | 1991 | 132.46148020068 | 1990 | 102.51432464552 | 1989 | 176.66804106736 | 1988 | 208.04838917529 | 1987 | 138.79843117297 | 1986 | 87.821056112608 | 1985 | 192.0018657737 | 1984 | 247.73506020115 | 1983 | 223.50818862466 | 1982 | 296.898557289 | 1981 | 263.1657132807 | 1980 | 262.16178013183 |
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