| Year | Value | | 2021 | 235,000 | | 2020 | 233,000 | | 2019 | 232,300 | | 2018 | 231,500 | | 2017 | 220,000 | | 2016 | 219,000 | | 2015 | 222,000 | | 2014 | 213,500 | | 2013 | 212,000 | | 2012 | 207,000 | | 2011 | 206,000 | | 2010 | 206,000 | | 2009 | 206,000 | | 2008 | 206,000 | | 2007 | 206,000 | | 2006 | 203,000 | | 2005 | 202,000 | | 2004 | 200,000 | | 2003 | 196,000 | | 2002 | 196,000 | | 2001 | 196,000 | | 2000 | 196,000 | | 1999 | 196,000 | | 1998 | 197,000 | | 1997 | 197,000 | | 1996 | 198,000 | | 1995 | 198,000 | | 1994 | 197,000 | | 1993 | 195,020 | | 1992 | 192,000 | | 1991 | 189,500 | | 1990 | 189,300 | | 1989 | 188,200 | | 1988 | 187,200 | | 1987 | 184,000 | | 1986 | 182,800 | | 1985 | 181,800 | | 1984 | 179,010 | | 1983 | 175,840 | | 1982 | 174,900 | | 1981 | 173,700 | | 1980 | 172,550 | | 1979 | 172,250 | | 1978 | 172,100 | | 1977 | 170,800 | | 1976 | 168,400 | | 1975 | 167,150 | | 1974 | 166,250 | | 1973 | 164,400 | | 1972 | 163,100 | | 1971 | 163,000 | | 1970 | 162,000 | | 1969 | 162,000 | | 1968 | 161,500 | | 1967 | 161,500 | | 1966 | 160,800 | | 1965 | 160,800 | | 1964 | 159,800 | | 1963 | 158,800 | | 1962 | 158,800 | | 1961 | 156,800 |
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