| Year | Value | | 2022 | 325,708 | | 2021 | 319,028 | | 2020 | 315,161 | | 2019 | 313,252 | | 2018 | 311,481 | | 2017 | 309,180 | | 2016 | 306,698 | | 2015 | 304,474 | | 2014 | 302,508 | | 2013 | 300,964 | | 2012 | 299,342 | | 2011 | 296,474 | | 2010 | 293,023 | | 2009 | 290,331 | | 2008 | 284,589 | | 2007 | 280,758 | | 2006 | 280,017 | | 2005 | 279,217 | | 2004 | 276,884 | | 2003 | 273,925 | | 2002 | 269,084 | | 2001 | 261,547 | | 2000 | 251,997 | | 1999 | 240,407 | | 1998 | 228,352 | | 1997 | 217,448 | | 1996 | 206,171 | | 1995 | 195,886 | | 1994 | 188,296 | | 1993 | 182,875 | | 1992 | 178,610 | | 1991 | 174,131 | | 1990 | 166,422 | | 1989 | 163,807 | | 1988 | 163,003 | | 1987 | 162,058 | | 1986 | 161,257 | | 1985 | 159,795 | | 1984 | 157,479 | | 1983 | 157,502 | | 1982 | 158,666 | | 1981 | 160,168 | | 1980 | 160,991 | | 1979 | 160,997 | | 1978 | 159,022 | | 1977 | 155,823 | | 1976 | 151,884 | | 1975 | 146,511 | | 1974 | 138,525 | | 1973 | 128,306 | | 1972 | 116,584 | | 1971 | 107,073 | | 1970 | 98,570 | | 1969 | 92,009 | | 1968 | 87,856 | | 1967 | 85,400 | | 1966 | 82,030 | | 1965 | 80,801 | | 1964 | 79,099 | | 1963 | 76,958 | | 1962 | 75,066 | | 1961 | 72,518 | | 1960 | 71,227 |
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