| Year | Value | | 2021 | 215,000 | | 2020 | 215,000 | | 2019 | 215,000 | | 2018 | 215,000 | | 2017 | 215,000 | | 2016 | 215,000 | | 2015 | 215,000 | | 2014 | 215,000 | | 2013 | 215,000 | | 2012 | 215,000 | | 2011 | 215,000 | | 2010 | 215,000 | | 2009 | 215,000 | | 2008 | 216,000 | | 2007 | 215,590 | | 2006 | 215,550 | | 2005 | 215,950 | | 2004 | 215,900 | | 2003 | 215,400 | | 2002 | 216,380 | | 2001 | 216,380 | | 2000 | 216,350 | | 1999 | 216,330 | | 1998 | 216,360 | | 1997 | 216,360 | | 1996 | 216,260 | | 1995 | 216,160 | | 1994 | 216,060 | | 1993 | 216,030 | | 1992 | 216,070 | | 1991 | 218,570 | | 1990 | 218,600 | | 1989 | 218,100 | | 1988 | 220,100 | | 1987 | 219,600 | | 1986 | 218,500 | | 1985 | 216,400 | | 1984 | 213,900 | | 1983 | 212,800 | | 1982 | 211,600 | | 1981 | 210,400 | | 1980 | 210,200 | | 1979 | 209,000 | | 1978 | 207,400 | | 1977 | 206,840 | | 1976 | 204,700 | | 1975 | 202,980 | | 1974 | 202,440 | | 1973 | 201,790 | | 1972 | 200,650 | | 1971 | 200,260 | | 1970 | 199,330 | | 1969 | 198,400 | | 1968 | 197,580 | | 1967 | 196,660 | | 1966 | 195,840 | | 1965 | 195,140 | | 1964 | 194,440 | | 1963 | 193,720 | | 1962 | 193,020 | | 1961 | 192,320 |
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