| Year | Value | | 2022 | 98,387 | | 2021 | 104,895 | | 2020 | 108,531 | | 2019 | 108,881 | | 2018 | 107,132 | | 2017 | 104,857 | | 2016 | 102,104 | | 2015 | 98,841 | | 2014 | 95,033 | | 2013 | 90,608 | | 2012 | 85,923 | | 2011 | 81,107 | | 2010 | 76,411 | | 2009 | 71,360 | | 2008 | 66,208 | | 2007 | 61,108 | | 2006 | 56,214 | | 2005 | 51,678 | | 2004 | 47,408 | | 2003 | 43,202 | | 2002 | 39,155 | | 2001 | 35,283 | | 2000 | 32,381 | | 1999 | 31,198 | | 1998 | 31,817 | | 1997 | 34,408 | | 1996 | 38,337 | | 1995 | 42,266 | | 1994 | 46,117 | | 1993 | 48,285 | | 1992 | 49,420 | | 1991 | 50,857 | | 1990 | 51,608 | | 1989 | 50,625 | | 1988 | 49,511 | | 1987 | 48,466 | | 1986 | 47,301 | | 1985 | 45,712 | | 1984 | 43,934 | | 1983 | 41,822 | | 1982 | 39,183 | | 1981 | 35,935 | | 1980 | 32,335 | | 1979 | 28,796 | | 1978 | 25,487 | | 1977 | 22,712 | | 1976 | 20,595 | | 1975 | 19,101 | | 1974 | 18,212 | | 1973 | 17,772 | | 1972 | 17,693 | | 1971 | 17,806 | | 1970 | 17,973 | | 1969 | 18,135 | | 1968 | 18,163 | | 1967 | 18,097 | | 1966 | 17,973 | | 1965 | 17,874 | | 1964 | 17,895 | | 1963 | 17,859 | | 1962 | 17,867 | | 1961 | 18,288 | | 1960 | 18,918 |
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