| Year | Value | | 2022 | 72,737 | | 2021 | 72,412 | | 2020 | 71,995 | | 2019 | 71,428 | | 2018 | 70,823 | | 2017 | 70,403 | | 2016 | 70,075 | | 2015 | 70,007 | | 2014 | 69,371 | | 2013 | 68,819 | | 2012 | 68,888 | | 2011 | 68,742 | | 2010 | 68,755 | | 2009 | 68,787 | | 2008 | 68,782 | | 2007 | 68,775 | | 2006 | 68,742 | | 2005 | 68,674 | | 2004 | 68,574 | | 2003 | 68,442 | | 2002 | 68,262 | | 2001 | 68,153 | | 2000 | 68,346 | | 1999 | 68,698 | | 1998 | 68,938 | | 1997 | 69,081 | | 1996 | 69,166 | | 1995 | 69,201 | | 1994 | 69,198 | | 1993 | 69,169 | | 1992 | 69,112 | | 1991 | 69,141 | | 1990 | 69,481 | | 1989 | 69,975 | | 1988 | 70,397 | | 1987 | 70,808 | | 1986 | 71,215 | | 1985 | 71,596 | | 1984 | 71,936 | | 1983 | 72,269 | | 1982 | 72,626 | | 1981 | 72,932 | | 1980 | 72,978 | | 1979 | 72,768 | | 1978 | 72,478 | | 1977 | 72,142 | | 1976 | 71,748 | | 1975 | 71,300 | | 1974 | 70,822 | | 1973 | 70,334 | | 1972 | 69,870 | | 1971 | 69,430 | | 1970 | 68,895 | | 1969 | 68,007 | | 1968 | 66,865 | | 1967 | 65,760 | | 1966 | 64,728 | | 1965 | 63,744 | | 1964 | 62,843 | | 1963 | 62,031 | | 1962 | 61,224 | | 1961 | 60,395 | | 1960 | 59,379 |
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