| Year | Value | | 2022 | 248,549 | | 2021 | 250,355 | | 2020 | 251,365 | | 2019 | 252,955 | | 2018 | 255,971 | | 2017 | 259,869 | | 2016 | 263,887 | | 2015 | 267,655 | | 2014 | 269,998 | | 2013 | 268,381 | | 2012 | 260,769 | | 2011 | 246,980 | | 2010 | 229,429 | | 2009 | 208,362 | | 2008 | 186,564 | | 2007 | 169,342 | | 2006 | 157,588 | | 2005 | 150,416 | | 2004 | 147,102 | | 2003 | 145,528 | | 2002 | 143,382 | | 2001 | 140,739 | | 2000 | 136,622 | | 1999 | 131,043 | | 1998 | 125,155 | | 1997 | 119,293 | | 1996 | 113,936 | | 1995 | 112,438 | | 1994 | 113,974 | | 1993 | 114,666 | | 1992 | 114,615 | | 1991 | 113,975 | | 1990 | 112,428 | | 1989 | 109,965 | | 1988 | 106,971 | | 1987 | 103,503 | | 1986 | 99,691 | | 1985 | 96,548 | | 1984 | 93,139 | | 1983 | 87,952 | | 1982 | 81,648 | | 1981 | 74,873 | | 1980 | 67,648 | | 1979 | 59,575 | | 1978 | 51,170 | | 1977 | 43,436 | | 1976 | 37,087 | | 1975 | 33,170 | | 1974 | 30,803 | | 1973 | 28,335 | | 1972 | 25,737 | | 1971 | 23,078 | | 1970 | 20,482 | | 1969 | 18,142 | | 1968 | 16,403 | | 1967 | 15,562 | | 1966 | 15,170 | | 1965 | 14,696 | | 1964 | 14,127 | | 1963 | 13,414 | | 1962 | 12,512 | | 1961 | 11,549 | | 1960 | 10,690 |
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