Year | Value | 2021 | 83,981.767 | 2020 | 167,785 | 2019 | 498,878 | 2018 | 474,940 | 2017 | 473,610.67 | 2016 | 447,001 | 2015 | 463,740 | 2014 | 443,318.55 | 2013 | 430,334.45775688 | 2012 | 343,382 | 2011 | 336,401 | 2010 | 302,185.22246687 | 2009 | 182,002 | 2008 | 176,549 | 2007 | 185,052 | 2006 | 163,665 | 2005 | 176,152 | 2004 | 170,054 | 2003 | 166,716 | 2002 | 189,382 | 2001 | 169,840 | 2000 | 169,263 | 1999 | 164,800 | 1998 | 174,000 | 1997 | 194,100 | 1996 | 188,300 | 1995 | 178,200 | 1994 | 175,000 | 1993 | 164,500 | 1992 | 164,800 | 1991 | 145,800 | 1990 | 130,500 | 1989 | 111,900 | 1988 | 109,400 | 1987 | 101,400 | 1986 | 94,100 | 1985 | 94,700 | 1984 | 95,100 | 1983 | 95,100 | 1982 | 95,800 | 1981 | 97,800 | 1980 | 88,600 | 1979 | 75,100 | 1978 | 71,900 | 1977 | 71,000 | 1976 | 73,700 | 1975 | 72,800 | 1974 | 70,700 | 1973 | 63,400 | 1972 | 38,600 | 1971 | 31,300 | 1970 | 27,700 |
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