| Year | Value | | 2022 | 68,640 | | 2021 | 69,373 | | 2020 | 70,147 | | 2019 | 71,073 | | 2018 | 72,166 | | 2017 | 73,176 | | 2016 | 73,970 | | 2015 | 74,548 | | 2014 | 75,075 | | 2013 | 75,525 | | 2012 | 75,747 | | 2011 | 75,808 | | 2010 | 75,875 | | 2009 | 75,854 | | 2008 | 75,621 | | 2007 | 75,176 | | 2006 | 74,714 | | 2005 | 74,434 | | 2004 | 74,227 | | 2003 | 74,016 | | 2002 | 73,865 | | 2001 | 73,845 | | 2000 | 73,915 | | 1999 | 74,614 | | 1998 | 76,177 | | 1997 | 77,916 | | 1996 | 79,417 | | 1995 | 80,600 | | 1994 | 81,658 | | 1993 | 81,744 | | 1992 | 80,561 | | 1991 | 79,126 | | 1990 | 77,747 | | 1989 | 76,449 | | 1988 | 74,871 | | 1987 | 73,073 | | 1986 | 71,339 | | 1985 | 69,390 | | 1984 | 67,374 | | 1983 | 65,596 | | 1982 | 63,845 | | 1981 | 62,196 | | 1980 | 60,510 | | 1979 | 58,614 | | 1978 | 56,657 | | 1977 | 54,686 | | 1976 | 52,743 | | 1975 | 50,813 | | 1974 | 48,942 | | 1973 | 47,192 | | 1972 | 45,532 | | 1971 | 43,920 | | 1970 | 42,424 | | 1969 | 41,055 | | 1968 | 39,835 | | 1967 | 38,740 | | 1966 | 37,656 | | 1965 | 36,593 | | 1964 | 35,617 | | 1963 | 34,688 | | 1962 | 33,814 | | 1961 | 33,020 | | 1960 | 32,274 |
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