Year | Value | 2022 | 35,740 | 2021 | 33,808 | 2020 | 32,649 | 2019 | 31,776 | 2018 | 31,119 | 2017 | 30,810 | 2016 | 30,792 | 2015 | 30,829 | 2014 | 31,106 | 2013 | 32,175 | 2012 | 34,046 | 2011 | 36,362 | 2010 | 39,269 | 2009 | 43,019 | 2008 | 46,758 | 2007 | 49,692 | 2006 | 51,769 | 2005 | 52,870 | 2004 | 53,048 | 2003 | 52,973 | 2002 | 52,688 | 2001 | 52,516 | 2000 | 52,595 | 1999 | 52,466 | 1998 | 51,839 | 1997 | 51,210 | 1996 | 50,996 | 1995 | 51,093 | 1994 | 51,667 | 1993 | 52,783 | 1992 | 54,170 | 1991 | 55,126 | 1990 | 55,935 | 1989 | 57,596 | 1988 | 58,594 | 1987 | 57,521 | 1986 | 55,725 | 1985 | 53,971 | 1984 | 52,372 | 1983 | 51,464 | 1982 | 51,761 | 1981 | 52,524 | 1980 | 53,426 | 1979 | 54,873 | 1978 | 56,211 | 1977 | 56,735 | 1976 | 56,818 | 1975 | 56,686 | 1974 | 55,877 | 1973 | 54,607 | 1972 | 53,311 | 1971 | 52,720 | 1970 | 52,635 | 1969 | 53,481 | 1968 | 54,823 | 1967 | 55,006 | 1966 | 53,719 | 1965 | 50,846 | 1964 | 46,867 | 1963 | 42,951 | 1962 | 40,509 | 1961 | 40,059 | 1960 | 40,904 |
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