| Year | Value | | 2021 | 395,212 | | 2020 | 395,212 | | 2019 | 393,097 | | 2018 | 390,974 | | 2017 | 388,851 | | 2016 | 386,728 | | 2015 | 384,605 | | 2014 | 382,482 | | 2013 | 380,359 | | 2012 | 374,975.94 | | 2011 | 376,113 | | 2010 | 373,990 | | 2009 | 371,867 | | 2008 | 369,744 | | 2007 | 364,184 | | 2006 | 358,713 | | 2005 | 353,142 | | 2004 | 347,571 | | 2003 | 342,700 | | 2002 | 342,000 | | 2001 | 341,000 | | 2000 | 340,000 | | 1999 | 339,000 | | 1998 | 338,000 | | 1997 | 337,030 | | 1996 | 334,219.9 | | 1995 | 330,499.9 | | 1994 | 326,779.9 | | 1993 | 323,059.9 | | 1992 | 319,339.9 | | 1991 | 315,619.9 | | 1990 | 311,899.9 | | 1989 | 320,000 | | 1988 | 320,000 | | 1987 | 320,000 | | 1986 | 320,000 | | 1985 | 320,000 | | 1984 | 310,000 | | 1983 | 310,000 | | 1982 | 310,000 | | 1981 | 310,000 | | 1980 | 300,000 | | 1979 | 300,000 | | 1978 | 300,000 | | 1977 | 290,000 | | 1976 | 290,000 | | 1975 | 290,000 | | 1974 | 290,000 | | 1973 | 290,000 | | 1972 | 290,000 | | 1971 | 290,000 | | 1970 | 280,000 | | 1969 | 270,000 | | 1968 | 270,000 | | 1967 | 270,000 | | 1966 | 270,000 | | 1965 | 270,000 | | 1964 | 270,000 | | 1963 | 270,000 | | 1962 | 260,000 | | 1961 | 260,000 |
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