| Year | Value | | 2022 | 177,353 | | 2021 | 180,605 | | 2020 | 182,447 | | 2019 | 182,861 | | 2018 | 182,426 | | 2017 | 180,381 | | 2016 | 177,051 | | 2015 | 174,784 | | 2014 | 174,184 | | 2013 | 174,792 | | 2012 | 176,383 | | 2011 | 177,629 | | 2010 | 177,374 | | 2009 | 175,877 | | 2008 | 173,141 | | 2007 | 170,379 | | 2006 | 169,309 | | 2005 | 169,362 | | 2004 | 168,575 | | 2003 | 165,755 | | 2002 | 161,956 | | 2001 | 158,547 | | 2000 | 156,219 | | 1999 | 156,382 | | 1998 | 160,462 | | 1997 | 167,125 | | 1996 | 173,770 | | 1995 | 179,757 | | 1994 | 185,205 | | 1993 | 189,471 | | 1992 | 191,642 | | 1991 | 192,388 | | 1990 | 192,814 | | 1989 | 193,103 | | 1988 | 192,523 | | 1987 | 192,594 | | 1986 | 194,533 | | 1985 | 197,044 | | 1984 | 199,266 | | 1983 | 201,810 | | 1982 | 204,825 | | 1981 | 206,657 | | 1980 | 208,755 | | 1979 | 213,441 | | 1978 | 219,650 | | 1977 | 225,395 | | 1976 | 230,620 | | 1975 | 232,313 | | 1974 | 224,546 | | 1973 | 209,723 | | 1972 | 190,167 | | 1971 | 173,901 | | 1970 | 162,937 | | 1969 | 157,744 | | 1968 | 158,676 | | 1967 | 160,195 | | 1966 | 156,508 | | 1965 | 153,097 | | 1964 | 153,369 | | 1963 | 149,354 | | 1962 | 146,387 | | 1961 | 146,917 | | 1960 | 149,085 |
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