| Year | Value | | 2022 | 30,691 | | 2021 | 33,762 | | 2020 | 36,226 | | 2019 | 38,172 | | 2018 | 39,207 | | 2017 | 39,482 | | 2016 | 39,088 | | 2015 | 37,974 | | 2014 | 36,145 | | 2013 | 33,543 | | 2012 | 30,357 | | 2011 | 27,028 | | 2010 | 23,824 | | 2009 | 20,842 | | 2008 | 18,119 | | 2007 | 15,715 | | 2006 | 13,773 | | 2005 | 12,654 | | 2004 | 12,136 | | 2003 | 11,716 | | 2002 | 11,353 | | 2001 | 11,045 | | 2000 | 10,794 | | 1999 | 10,573 | | 1998 | 10,352 | | 1997 | 10,106 | | 1996 | 9,837 | | 1995 | 9,580 | | 1994 | 9,376 | | 1993 | 9,190 | | 1992 | 8,982 | | 1991 | 8,746 | | 1990 | 8,474 | | 1989 | 8,220 | | 1988 | 7,982 | | 1987 | 7,710 | | 1986 | 7,402 | | 1985 | 7,055 | | 1984 | 6,658 | | 1983 | 6,264 | | 1982 | 5,943 | | 1981 | 5,703 | | 1980 | 5,528 | | 1979 | 5,400 | | 1978 | 5,309 | | 1977 | 5,187 | | 1976 | 5,034 | | 1975 | 4,910 | | 1974 | 4,802 | | 1973 | 4,698 | | 1972 | 4,608 | | 1971 | 4,540 | | 1970 | 4,496 | | 1969 | 4,474 | | 1968 | 4,472 | | 1967 | 4,518 | | 1966 | 4,625 | | 1965 | 4,722 | | 1964 | 4,733 | | 1963 | 4,682 | | 1962 | 4,616 | | 1961 | 4,528 | | 1960 | 4,416 |
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