Year | Value | 2021 | 15,996 | 2020 | 12,056.18 | 2019 | 50,575 | 2018 | 53,033 | 2017 | 50,837 | 2016 | 55,430 | 2015 | 61,649 | 2014 | 61,248 | 2013 | 58,687 | 2012 | 54,250.922618879 | 2011 | 49,193 | 2010 | 60,835 | 2009 | 46,485 | 2008 | 49,162 | 2007 | 44,842 | 2006 | 31,016 | 2005 | 29,844 | 2004 | 28,422 | 2003 | 24,801 | 2002 | 15,407 | 2001 | 16,523 | 2000 | 18,419 | 1999 | 20,200 | 1998 | 26,900 | 1997 | 26,200 | 1996 | 22,500 | 1995 | 21,800 | 1994 | 43,400 | 1993 | 45,000 | 1992 | 20,300 | 1991 | 27,900 | 1990 | 27,900 | 1989 | 27,800 | 1988 | 27,300 | 1987 | 27,600 | 1986 | 27,000 | 1985 | 26,300 | 1984 | 26,600 | 1983 | 26,500 | 1982 | 27,300 | 1981 | 27,400 | 1980 | 27,900 | 1979 | 25,600 | 1978 | 24,700 | 1977 | 23,000 | 1976 | 21,500 | 1975 | 20,800 | 1974 | 19,600 | 1973 | 20,700 | 1972 | 19,900 | 1971 | 21,100 | 1970 | 28,200 |
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