| Year | Value | | 2022 | 76,128 | | 2021 | 75,282 | | 2020 | 74,438 | | 2019 | 73,850 | | 2018 | 72,817 | | 2017 | 71,681 | | 2016 | 71,397 | | 2015 | 71,078 | | 2014 | 70,627 | | 2013 | 71,106 | | 2012 | 71,381 | | 2011 | 70,507 | | 2010 | 69,402 | | 2009 | 68,202 | | 2008 | 67,317 | | 2007 | 67,662 | | 2006 | 69,639 | | 2005 | 72,901 | | 2004 | 76,678 | | 2003 | 80,266 | | 2002 | 83,009 | | 2001 | 84,672 | | 2000 | 85,181 | | 1999 | 84,241 | | 1998 | 82,330 | | 1997 | 80,483 | | 1996 | 79,257 | | 1995 | 79,201 | | 1994 | 80,632 | | 1993 | 83,189 | | 1992 | 86,368 | | 1991 | 89,037 | | 1990 | 90,651 | | 1989 | 91,425 | | 1988 | 90,933 | | 1987 | 89,056 | | 1986 | 85,761 | | 1985 | 81,111 | | 1984 | 75,688 | | 1983 | 69,760 | | 1982 | 63,629 | | 1981 | 58,626 | | 1980 | 56,283 | | 1979 | 56,863 | | 1978 | 59,677 | | 1977 | 64,070 | | 1976 | 69,041 | | 1975 | 73,035 | | 1974 | 75,192 | | 1973 | 75,873 | | 1972 | 75,766 | | 1971 | 75,408 | | 1970 | 75,093 | | 1969 | 74,692 | | 1968 | 74,040 | | 1967 | 73,287 | | 1966 | 72,568 | | 1965 | 71,702 | | 1964 | 70,467 | | 1963 | 68,896 | | 1962 | 67,094 | | 1961 | 65,173 | | 1960 | 63,095 |
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