| Year | Value | | 2021 | 51,676.657007411 | | 2020 | 38,207.176449133 | | 2019 | 48,711.319989743 | | 2018 | 51,683.180944647 | | 2017 | 48,124.73676968 | | 2016 | 46,708.399380677 | | 2015 | 51,242.558840427 | | 2014 | 66,216.934121358 | | 2013 | 68,766.72290811 | | 2012 | 69,033.676742683 | | 2011 | 63,532.874071615 | | 2010 | 47,493.891942436 | | 2009 | 39,662.069646963 | | 2008 | 53,179.384639198 | | 2007 | 45,383.603020679 | | 2006 | 42,825.10911042 | | 2005 | 35,617.607474436 | | 2004 | 29,684.089123335 | | 2003 | 24,867.544243144 | | 2002 | 20,769.753083015 | | 2001 | 18,013.967081972 | | 2000 | 17,659.536148385 | | 1999 | 13,614.993178186 | | 1998 | 12,087.630911392 | | 1997 | 14,852.926323577 | | 1996 | 10,831.44708247 | | 1995 | 11,352.773717629 | | 1994 | 10,508.092999686 | | 1993 | 10,562.687076981 | | 1992 | 11,572.532567436 | | 1991 | 10,801.710633376 | | 1990 | 9,337.8159214292 | | 1989 | 10,679.722166937 | | 1988 | 11,619.121813531 | | 1987 | 11,459.798658116 | | 1986 | 11,769.84722774 | | 1985 | 13,359.111086825 | | 1984 | 12,597.165711789 | | 1983 | 14,854.246497006 | | 1982 | 18,403.459381846 | | 1981 | 19,104.337624933 | | 1980 | 14,173.472169073 | | 1979 | 4,807.0943209675 | | 1978 | 7,516.7457762695 | | 1977 | 6,886.605833638 | | 1976 | 5,947.1708938386 |
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