| Year | Value | | 2022 | 310,833 | | 2021 | 315,368 | | 2020 | 320,007 | | 2019 | 324,986 | | 2018 | 329,029 | | 2017 | 330,847 | | 2016 | 335,000 | | 2015 | 341,267 | | 2014 | 344,597 | | 2013 | 346,603 | | 2012 | 349,787 | | 2011 | 361,131 | | 2010 | 366,940 | | 2009 | 360,399 | | 2008 | 353,611 | | 2007 | 345,382 | | 2006 | 336,079 | | 2005 | 324,795 | | 2004 | 311,758 | | 2003 | 299,540 | | 2002 | 289,763 | | 2001 | 283,229 | | 2000 | 280,528 | | 1999 | 281,704 | | 1998 | 284,947 | | 1997 | 288,663 | | 1996 | 292,732 | | 1995 | 297,090 | | 1994 | 301,671 | | 1993 | 306,101 | | 1992 | 309,816 | | 1991 | 312,331 | | 1990 | 313,251 | | 1989 | 312,120 | | 1988 | 308,886 | | 1987 | 304,547 | | 1986 | 300,089 | | 1985 | 296,253 | | 1984 | 293,826 | | 1983 | 289,153 | | 1982 | 281,184 | | 1981 | 272,868 | | 1980 | 263,972 | | 1979 | 254,216 | | 1978 | 244,042 | | 1977 | 233,374 | | 1976 | 222,951 | | 1975 | 214,106 | | 1974 | 207,388 | | 1973 | 207,549 | | 1972 | 210,714 | | 1971 | 210,486 | | 1970 | 209,363 | | 1969 | 207,183 | | 1968 | 202,368 | | 1967 | 194,266 | | 1966 | 183,237 | | 1965 | 171,032 | | 1964 | 161,022 | | 1963 | 152,680 | | 1962 | 144,163 | | 1961 | 136,215 | | 1960 | 128,970 |
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