| Year | Value | | 2019 | 317,976 | | 2018 | 307,981 | | 2017 | 298,413 | | 2016 | 289,266 | | 2015 | 280,532 | | 2014 | 272,057 | | 2013 | 263,832 | | 2012 | 255,905 | | 2011 | 248,357 | | 2010 | 241,233 | | 2009 | 234,138 | | 2008 | 227,377 | | 2007 | 220,883 | | 2006 | 214,528 | | 2005 | 208,225 | | 2004 | 201,468 | | 2003 | 194,810 | | 2002 | 188,293 | | 2001 | 181,972 | | 2000 | 175,882 | | 1999 | 169,708 | | 1998 | 163,713 | | 1997 | 157,900 | | 1996 | 152,273 | | 1995 | 146,840 | | 1994 | 140,749 | | 1993 | 134,910 | | 1992 | 129,510 | | 1991 | 124,823 | | 1990 | 121,026 | | 1989 | 117,959 | | 1988 | 115,606 | | 1987 | 113,851 | | 1986 | 112,486 | | 1985 | 111,343 | | 1984 | 110,090 | | 1983 | 109,047 | | 1982 | 108,000 | | 1981 | 106,647 | | 1980 | 104,804 | | 1979 | 102,104 | | 1978 | 98,766 | | 1977 | 95,089 | | 1976 | 91,577 | | 1975 | 88,562 | | 1974 | 85,739 | | 1973 | 83,377 | | 1972 | 81,408 | | 1971 | 79,661 | | 1970 | 78,026 | | 1969 | 76,291 | | 1968 | 74,703 | | 1967 | 73,306 | | 1966 | 72,173 | | 1965 | 71,361 | | 1964 | 70,488 | | 1963 | 69,851 | | 1962 | 69,432 | | 1961 | 69,190 | | 1960 | 69,114 |
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