| Year | Value | | 2022 | 74,242 | | 2021 | 73,116 | | 2020 | 71,584 | | 2019 | 70,400 | | 2018 | 69,822 | | 2017 | 70,135 | | 2016 | 71,585 | | 2015 | 73,639 | | 2014 | 75,449 | | 2013 | 76,590 | | 2012 | 77,013 | | 2011 | 76,894 | | 2010 | 76,569 | | 2009 | 75,951 | | 2008 | 75,152 | | 2007 | 75,281 | | 2006 | 75,460 | | 2005 | 75,874 | | 2004 | 76,495 | | 2003 | 77,175 | | 2002 | 77,363 | | 2001 | 76,744 | | 2000 | 75,909 | | 1999 | 74,639 | | 1998 | 72,817 | | 1997 | 70,896 | | 1996 | 68,576 | | 1995 | 64,452 | | 1994 | 60,064 | | 1993 | 58,203 | | 1992 | 57,757 | | 1991 | 57,699 | | 1990 | 59,097 | | 1989 | 61,090 | | 1988 | 61,388 | | 1987 | 60,600 | | 1986 | 59,702 | | 1985 | 59,188 | | 1984 | 59,379 | | 1983 | 60,030 | | 1982 | 61,000 | | 1981 | 62,309 | | 1980 | 63,842 | | 1979 | 64,683 | | 1978 | 64,762 | | 1977 | 64,529 | | 1976 | 64,022 | | 1975 | 63,104 | | 1974 | 62,506 | | 1973 | 62,394 | | 1972 | 61,938 | | 1971 | 60,986 | | 1970 | 59,117 | | 1969 | 56,230 | | 1968 | 51,537 | | 1967 | 45,135 | | 1966 | 38,964 | | 1965 | 34,718 | | 1964 | 34,124 | | 1963 | 37,244 | | 1962 | 42,457 | | 1961 | 47,856 | | 1960 | 52,089 |
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