Year | Value | 2022 | 172,851 | 2021 | 174,076 | 2020 | 175,828 | 2019 | 176,403 | 2018 | 176,657 | 2017 | 177,268 | 2016 | 177,131 | 2015 | 176,769 | 2014 | 176,200 | 2013 | 174,521 | 2012 | 170,909 | 2011 | 165,290 | 2010 | 158,915 | 2009 | 152,986 | 2008 | 147,847 | 2007 | 143,685 | 2006 | 140,822 | 2005 | 139,320 | 2004 | 139,142 | 2003 | 139,360 | 2002 | 139,009 | 2001 | 139,184 | 2000 | 140,640 | 1999 | 142,907 | 1998 | 146,382 | 1997 | 151,545 | 1996 | 157,649 | 1995 | 162,719 | 1994 | 166,993 | 1993 | 170,515 | 1992 | 172,136 | 1991 | 172,539 | 1990 | 173,239 | 1989 | 173,882 | 1988 | 172,261 | 1987 | 168,457 | 1986 | 164,810 | 1985 | 161,744 | 1984 | 159,493 | 1983 | 158,550 | 1982 | 158,206 | 1981 | 158,035 | 1980 | 158,234 | 1979 | 158,037 | 1978 | 157,438 | 1977 | 157,100 | 1976 | 156,247 | 1975 | 155,199 | 1974 | 154,833 | 1973 | 155,409 | 1972 | 156,921 | 1971 | 159,876 | 1970 | 162,315 | 1969 | 162,369 | 1968 | 159,371 | 1967 | 152,496 | 1966 | 141,950 | 1965 | 131,551 | 1964 | 123,364 | 1963 | 116,382 | 1962 | 111,394 | 1961 | 108,504 | 1960 | 106,061 |
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