Year | Value | 2022 | 23,222 | 2021 | 23,253 | 2020 | 23,148 | 2019 | 22,745 | 2018 | 22,149 | 2017 | 21,531 | 2016 | 20,753 | 2015 | 20,130 | 2014 | 19,503 | 2013 | 18,846 | 2012 | 18,357 | 2011 | 17,817 | 2010 | 17,328 | 2009 | 17,066 | 2008 | 16,690 | 2007 | 16,192 | 2006 | 15,711 | 2005 | 15,331 | 2004 | 15,201 | 2003 | 15,182 | 2002 | 15,263 | 2001 | 15,562 | 2000 | 15,596 | 1999 | 15,606 | 1998 | 15,915 | 1997 | 16,148 | 1996 | 16,213 | 1995 | 16,304 | 1994 | 16,380 | 1993 | 16,435 | 1992 | 16,442 | 1991 | 16,344 | 1990 | 16,202 | 1989 | 16,081 | 1988 | 16,018 | 1987 | 15,867 | 1986 | 15,622 | 1985 | 15,389 | 1984 | 15,250 | 1983 | 15,127 | 1982 | 14,976 | 1981 | 14,723 | 1980 | 14,399 | 1979 | 14,143 | 1978 | 13,811 | 1977 | 13,401 | 1976 | 13,065 | 1975 | 12,655 | 1974 | 12,132 | 1973 | 11,681 | 1972 | 11,325 | 1971 | 10,937 | 1970 | 10,794 | 1969 | 10,957 | 1968 | 11,104 | 1967 | 11,146 | 1966 | 11,145 | 1965 | 11,123 | 1964 | 10,999 | 1963 | 10,865 | 1962 | 10,820 | 1961 | 10,928 | 1960 | 11,223 |
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