| Year | Value | | 2022 | 75,177 | | 2021 | 75,645 | | 2020 | 75,588 | | 2019 | 74,576 | | 2018 | 73,560 | | 2017 | 72,962 | | 2016 | 72,204 | | 2015 | 71,178 | | 2014 | 70,665 | | 2013 | 70,597 | | 2012 | 71,146 | | 2011 | 72,549 | | 2010 | 74,528 | | 2009 | 76,145 | | 2008 | 76,782 | | 2007 | 77,264 | | 2006 | 76,832 | | 2005 | 76,353 | | 2004 | 75,978 | | 2003 | 75,887 | | 2002 | 76,083 | | 2001 | 76,509 | | 2000 | 76,958 | | 1999 | 77,368 | | 1998 | 77,975 | | 1997 | 78,456 | | 1996 | 78,267 | | 1995 | 77,889 | | 1994 | 77,068 | | 1993 | 75,536 | | 1992 | 73,697 | | 1991 | 71,340 | | 1990 | 66,920 | | 1989 | 62,254 | | 1988 | 60,203 | | 1987 | 59,469 | | 1986 | 58,673 | | 1985 | 59,460 | | 1984 | 61,304 | | 1983 | 61,414 | | 1982 | 60,512 | | 1981 | 60,378 | | 1980 | 60,638 | | 1979 | 60,736 | | 1978 | 61,279 | | 1977 | 62,189 | | 1976 | 63,072 | | 1975 | 63,958 | | 1974 | 64,795 | | 1973 | 65,188 | | 1972 | 65,108 | | 1971 | 64,826 | | 1970 | 64,286 | | 1969 | 63,832 | | 1968 | 63,634 | | 1967 | 63,050 | | 1966 | 61,828 | | 1965 | 59,691 | | 1964 | 56,616 | | 1963 | 51,723 | | 1962 | 45,316 | | 1961 | 39,337 | | 1960 | 35,299 |
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