Year | Value | 2022 | 31,423 | 2021 | 33,994 | 2020 | 35,851 | 2019 | 36,430 | 2018 | 36,344 | 2017 | 35,902 | 2016 | 35,332 | 2015 | 34,934 | 2014 | 34,715 | 2013 | 34,145 | 2012 | 33,293 | 2011 | 32,588 | 2010 | 31,612 | 2009 | 30,002 | 2008 | 27,576 | 2007 | 24,332 | 2006 | 21,212 | 2005 | 18,561 | 2004 | 16,472 | 2003 | 15,115 | 2002 | 14,606 | 2001 | 14,719 | 2000 | 15,154 | 1999 | 15,902 | 1998 | 16,928 | 1997 | 18,225 | 1996 | 19,876 | 1995 | 21,561 | 1994 | 22,860 | 1993 | 23,313 | 1992 | 23,265 | 1991 | 23,330 | 1990 | 23,303 | 1989 | 23,076 | 1988 | 22,753 | 1987 | 22,499 | 1986 | 22,226 | 1985 | 21,800 | 1984 | 21,321 | 1983 | 20,917 | 1982 | 20,630 | 1981 | 20,392 | 1980 | 20,104 | 1979 | 19,719 | 1978 | 19,448 | 1977 | 19,558 | 1976 | 19,849 | 1975 | 20,042 | 1974 | 20,077 | 1973 | 19,966 | 1972 | 19,883 | 1971 | 19,859 | 1970 | 20,000 | 1969 | 19,601 | 1968 | 18,622 | 1967 | 17,974 | 1966 | 17,572 | 1965 | 17,534 | 1964 | 17,773 | 1963 | 18,015 | 1962 | 18,275 | 1961 | 18,553 | 1960 | 18,815 |
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