| Year | Value | | 2022 | 16,923 | | 2021 | 15,859 | | 2020 | 14,842 | | 2019 | 13,945 | | 2018 | 13,129 | | 2017 | 12,396 | | 2016 | 11,754 | | 2015 | 11,185 | | 2014 | 10,664 | | 2013 | 10,274 | | 2012 | 9,997 | | 2011 | 9,697 | | 2010 | 9,360 | | 2009 | 9,018 | | 2008 | 8,702 | | 2007 | 8,416 | | 2006 | 8,162 | | 2005 | 7,957 | | 2004 | 7,759 | | 2003 | 7,506 | | 2002 | 7,177 | | 2001 | 6,756 | | 2000 | 6,258 | | 1999 | 5,725 | | 1998 | 5,208 | | 1997 | 4,748 | | 1996 | 4,361 | | 1995 | 4,040 | | 1994 | 3,789 | | 1993 | 3,614 | | 1992 | 3,490 | | 1991 | 3,401 | | 1990 | 3,342 | | 1989 | 3,309 | | 1988 | 3,295 | | 1987 | 3,289 | | 1986 | 3,288 | | 1985 | 3,301 | | 1984 | 3,337 | | 1983 | 3,374 | | 1982 | 3,388 | | 1981 | 3,382 | | 1980 | 3,357 | | 1979 | 3,312 | | 1978 | 3,254 | | 1977 | 3,202 | | 1976 | 3,159 | | 1975 | 3,107 | | 1974 | 3,044 | | 1973 | 2,975 | | 1972 | 2,901 | | 1971 | 2,820 | | 1970 | 2,731 | | 1969 | 2,639 | | 1968 | 2,543 | | 1967 | 2,423 | | 1966 | 2,272 | | 1965 | 2,133 | | 1964 | 2,043 | | 1963 | 1,978 | | 1962 | 1,909 | | 1961 | 1,840 | | 1960 | 1,772 |
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