| Year | Value | | 2022 | 70,970 | | 2021 | 71,846 | | 2020 | 73,281 | | 2019 | 74,515 | | 2018 | 74,914 | | 2017 | 75,008 | | 2016 | 74,442 | | 2015 | 72,885 | | 2014 | 70,182 | | 2013 | 66,460 | | 2012 | 62,074 | | 2011 | 57,405 | | 2010 | 52,687 | | 2009 | 48,220 | | 2008 | 44,285 | | 2007 | 40,873 | | 2006 | 37,898 | | 2005 | 35,324 | | 2004 | 33,101 | | 2003 | 31,151 | | 2002 | 29,398 | | 2001 | 27,811 | | 2000 | 26,402 | | 1999 | 25,186 | | 1998 | 24,122 | | 1997 | 23,155 | | 1996 | 22,282 | | 1995 | 21,502 | | 1994 | 20,782 | | 1993 | 20,169 | | 1992 | 19,645 | | 1991 | 19,113 | | 1990 | 18,558 | | 1989 | 17,975 | | 1988 | 17,355 | | 1987 | 16,671 | | 1986 | 15,863 | | 1985 | 14,868 | | 1984 | 13,677 | | 1983 | 12,346 | | 1982 | 11,329 | | 1981 | 10,733 | | 1980 | 10,286 | | 1979 | 10,107 | | 1978 | 10,013 | | 1977 | 9,842 | | 1976 | 9,811 | | 1975 | 9,855 | | 1974 | 9,816 | | 1973 | 9,903 | | 1972 | 10,170 | | 1971 | 10,447 | | 1970 | 10,711 | | 1969 | 10,910 | | 1968 | 10,894 | | 1967 | 10,708 | | 1966 | 10,516 | | 1965 | 10,338 | | 1964 | 10,172 | | 1963 | 10,021 | | 1962 | 9,876 | | 1961 | 9,737 | | 1960 | 9,603 |
|