Year | Value | 2021 | 27,650 | 2020 | 18,719 | 2019 | 76,049 | 2018 | 77,463 | 2017 | 74,714 | 2016 | 73,465 | 2015 | 65,940 | 2014 | 60,066 | 2013 | 55,516 | 2012 | 54,292 | 2011 | 53,286 | 2010 | 53,088 | 2009 | 52,731 | 2008 | 31,026 | 2007 | 44,136 | 2006 | 44,822 | 2005 | 45,692 | 2004 | 48,531 | 2003 | 44,315 | 2002 | 46,015 | 2001 | 49,274 | 2000 | 40,202 | 1999 | 36,400 | 1998 | 44,200 | 1997 | 49,600 | 1996 | 45,100 | 1995 | 47,000 | 1994 | 45,500 | 1993 | 45,400 | 1992 | 45,900 | 1991 | 45,600 | 1990 | 44,100 | 1989 | 45,700 | 1988 | 49,400 | 1987 | 48,400 | 1986 | 50,500 | 1985 | 46,200 | 1984 | 43,400 | 1983 | 40,300 | 1982 | 38,700 | 1981 | 38,200 | 1980 | 36,500 | 1979 | 34,800 | 1978 | 35,000 | 1977 | 32,900 | 1976 | 34,400 | 1975 | 31,900 | 1974 | 29,300 | 1973 | 26,200 | 1972 | 19,300 | 1971 | 17,400 | 1970 | 14,800 |
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