Year | Value | 2022 | 38,409 | 2021 | 36,457 | 2020 | 34,474 | 2019 | 32,674 | 2018 | 31,113 | 2017 | 29,801 | 2016 | 28,755 | 2015 | 27,966 | 2014 | 27,389 | 2013 | 26,974 | 2012 | 26,682 | 2011 | 26,475 | 2010 | 26,434 | 2009 | 26,609 | 2008 | 26,680 | 2007 | 26,348 | 2006 | 25,641 | 2005 | 24,786 | 2004 | 24,261 | 2003 | 24,417 | 2002 | 25,027 | 2001 | 25,677 | 2000 | 26,107 | 1999 | 26,162 | 1998 | 25,807 | 1997 | 25,177 | 1996 | 24,461 | 1995 | 23,785 | 1994 | 23,200 | 1993 | 22,672 | 1992 | 22,118 | 1991 | 21,484 | 1990 | 20,912 | 1989 | 20,506 | 1988 | 20,187 | 1987 | 19,895 | 1986 | 19,609 | 1985 | 19,333 | 1984 | 19,084 | 1983 | 18,883 | 1982 | 18,742 | 1981 | 18,660 | 1980 | 18,697 | 1979 | 18,828 | 1978 | 18,941 | 1977 | 19,001 | 1976 | 18,957 | 1975 | 18,751 | 1974 | 18,293 | 1973 | 17,537 | 1972 | 16,651 | 1971 | 15,863 | 1970 | 15,304 | 1969 | 14,950 | 1968 | 14,778 | 1967 | 14,745 | 1966 | 14,703 | 1965 | 14,547 | 1964 | 14,287 | 1963 | 13,941 | 1962 | 13,521 | 1961 | 13,126 | 1960 | 12,824 |
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