| Year | Value | | 2022 | 239,728 | | 2021 | 222,901 | | 2020 | 207,037 | | 2019 | 195,292 | | 2018 | 185,525 | | 2017 | 177,957 | | 2016 | 173,103 | | 2015 | 170,416 | | 2014 | 168,581 | | 2013 | 167,351 | | 2012 | 166,848 | | 2011 | 166,470 | | 2010 | 166,415 | | 2009 | 166,005 | | 2008 | 164,653 | | 2007 | 163,322 | | 2006 | 161,742 | | 2005 | 160,246 | | 2004 | 159,576 | | 2003 | 160,039 | | 2002 | 162,015 | | 2001 | 165,049 | | 2000 | 167,664 | | 1999 | 168,177 | | 1998 | 165,890 | | 1997 | 161,222 | | 1996 | 154,668 | | 1995 | 147,113 | | 1994 | 140,420 | | 1993 | 136,994 | | 1992 | 134,940 | | 1991 | 131,211 | | 1990 | 127,193 | | 1989 | 122,515 | | 1988 | 116,321 | | 1987 | 110,070 | | 1986 | 103,686 | | 1985 | 96,496 | | 1984 | 88,479 | | 1983 | 79,589 | | 1982 | 71,914 | | 1981 | 69,261 | | 1980 | 71,207 | | 1979 | 78,000 | | 1978 | 89,644 | | 1977 | 100,702 | | 1976 | 106,519 | | 1975 | 108,467 | | 1974 | 108,673 | | 1973 | 105,785 | | 1972 | 100,694 | | 1971 | 96,256 | | 1970 | 93,977 | | 1969 | 93,180 | | 1968 | 93,684 | | 1967 | 95,048 | | 1966 | 94,778 | | 1965 | 91,343 | | 1964 | 85,523 | | 1963 | 77,263 | | 1962 | 67,235 | | 1961 | 57,708 | | 1960 | 49,963 |
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