Year | Value | 2022 | 168,947 | 2021 | 167,713 | 2020 | 167,833 | 2019 | 168,616 | 2018 | 169,276 | 2017 | 170,415 | 2016 | 171,661 | 2015 | 172,509 | 2014 | 173,694 | 2013 | 174,847 | 2012 | 175,239 | 2011 | 174,552 | 2010 | 172,368 | 2009 | 168,984 | 2008 | 164,911 | 2007 | 160,072 | 2006 | 155,307 | 2005 | 151,019 | 2004 | 146,584 | 2003 | 142,406 | 2002 | 139,400 | 2001 | 137,617 | 2000 | 137,368 | 1999 | 139,256 | 1998 | 142,871 | 1997 | 147,019 | 1996 | 151,441 | 1995 | 156,918 | 1994 | 162,547 | 1993 | 167,429 | 1992 | 172,643 | 1991 | 177,643 | 1990 | 179,364 | 1989 | 178,916 | 1988 | 179,149 | 1987 | 180,653 | 1986 | 184,575 | 1985 | 190,439 | 1984 | 196,107 | 1983 | 200,572 | 1982 | 201,622 | 1981 | 198,175 | 1980 | 193,268 | 1979 | 188,727 | 1978 | 184,438 | 1977 | 181,528 | 1976 | 180,334 | 1975 | 180,091 | 1974 | 180,483 | 1973 | 181,209 | 1972 | 181,640 | 1971 | 181,456 | 1970 | 181,454 | 1969 | 182,207 | 1968 | 184,133 | 1967 | 188,529 | 1966 | 195,425 | 1965 | 202,274 | 1964 | 207,324 | 1963 | 209,100 | 1962 | 205,982 | 1961 | 197,450 | 1960 | 186,226 |
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