| Year | Value | | 2022 | 60,740 | | 2021 | 62,616 | | 2020 | 64,059 | | 2019 | 65,504 | | 2018 | 66,548 | | 2017 | 67,496 | | 2016 | 69,110 | | 2015 | 71,129 | | 2014 | 72,878 | | 2013 | 74,168 | | 2012 | 75,088 | | 2011 | 75,786 | | 2010 | 75,962 | | 2009 | 75,177 | | 2008 | 73,944 | | 2007 | 73,391 | | 2006 | 72,267 | | 2005 | 71,092 | | 2004 | 70,423 | | 2003 | 70,395 | | 2002 | 71,015 | | 2001 | 72,368 | | 2000 | 74,211 | | 1999 | 75,812 | | 1998 | 76,983 | | 1997 | 77,706 | | 1996 | 77,811 | | 1995 | 77,611 | | 1994 | 77,419 | | 1993 | 77,521 | | 1992 | 77,995 | | 1991 | 78,734 | | 1990 | 79,447 | | 1989 | 80,356 | | 1988 | 81,489 | | 1987 | 82,141 | | 1986 | 81,377 | | 1985 | 80,380 | | 1984 | 79,505 | | 1983 | 77,681 | | 1982 | 75,281 | | 1981 | 72,720 | | 1980 | 68,258 | | 1979 | 63,163 | | 1978 | 60,682 | | 1977 | 59,707 | | 1976 | 59,196 | | 1975 | 60,124 | | 1974 | 61,913 | | 1973 | 62,185 | | 1972 | 61,258 | | 1971 | 60,810 | | 1970 | 60,838 | | 1969 | 61,230 | | 1968 | 62,183 | | 1967 | 63,368 | | 1966 | 64,451 | | 1965 | 65,601 | | 1964 | 66,470 | | 1963 | 66,606 | | 1962 | 66,420 | | 1961 | 66,182 | | 1960 | 65,852 |
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