| Year | Value | | 2024 | 323,581 | | 2023 | 323,484 | | 2022 | 323,564 | | 2021 | 324,278 | | 2020 | 324,903 | | 2019 | 324,836 | | 2018 | 324,634 | | 2017 | 324,382 | | 2016 | 324,047 | | 2015 | 323,716 | | 2014 | 323,306 | | 2013 | 322,793 | | 2012 | 322,291 | | 2011 | 321,863 | | 2010 | 321,579 | | 2009 | 321,266 | | 2008 | 320,909 | | 2007 | 320,697 | | 2006 | 320,615 | | 2005 | 320,604 | | 2004 | 320,562 | | 2003 | 320,045 | | 2002 | 318,318 | | 2001 | 316,469 | | 2000 | 314,602 | | 1999 | 314,564 | | 1998 | 314,874 | | 1997 | 315,324 | | 1996 | 315,626 | | 1995 | 315,573 | | 1994 | 315,027 | | 1993 | 314,051 | | 1992 | 312,888 | | 1991 | 311,914 | | 1990 | 311,401 | | 1989 | 311,464 | | 1988 | 311,915 | | 1987 | 312,367 | | 1986 | 312,252 | | 1985 | 311,189 | | 1984 | 309,015 | | 1983 | 305,911 | | 1982 | 302,265 | | 1981 | 298,630 | | 1980 | 295,405 | | 1979 | 292,774 | | 1978 | 290,582 | | 1977 | 288,583 | | 1976 | 286,373 | | 1975 | 283,658 |
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