| Year | Value | | 2022 | 68,467 | | 2021 | 69,584 | | 2020 | 71,169 | | 2019 | 72,442 | | 2018 | 73,318 | | 2017 | 73,994 | | 2016 | 74,632 | | 2015 | 74,833 | | 2014 | 74,440 | | 2013 | 74,003 | | 2012 | 73,635 | | 2011 | 72,784 | | 2010 | 71,647 | | 2009 | 70,922 | | 2008 | 70,435 | | 2007 | 71,077 | | 2006 | 72,226 | | 2005 | 74,014 | | 2004 | 75,724 | | 2003 | 76,873 | | 2002 | 77,333 | | 2001 | 77,182 | | 2000 | 76,768 | | 1999 | 76,311 | | 1998 | 76,201 | | 1997 | 76,578 | | 1996 | 77,225 | | 1995 | 77,948 | | 1994 | 78,721 | | 1993 | 79,676 | | 1992 | 80,418 | | 1991 | 80,521 | | 1990 | 80,313 | | 1989 | 79,625 | | 1988 | 78,052 | | 1987 | 75,819 | | 1986 | 72,389 | | 1985 | 67,141 | | 1984 | 62,272 | | 1983 | 59,969 | | 1982 | 59,099 | | 1981 | 59,044 | | 1980 | 60,612 | | 1979 | 62,408 | | 1978 | 62,386 | | 1977 | 61,333 | | 1976 | 60,666 | | 1975 | 60,262 | | 1974 | 60,412 | | 1973 | 61,313 | | 1972 | 62,422 | | 1971 | 63,602 | | 1970 | 64,944 | | 1969 | 65,982 | | 1968 | 66,354 | | 1967 | 66,217 | | 1966 | 65,690 | | 1965 | 64,879 | | 1964 | 64,169 | | 1963 | 63,687 | | 1962 | 63,097 | | 1961 | 62,192 | | 1960 | 60,475 |
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