Year | Value | 2022 | 24,391 | 2021 | 24,408 | 2020 | 24,416 | 2019 | 24,086 | 2018 | 23,262 | 2017 | 22,410 | 2016 | 21,683 | 2015 | 20,930 | 2014 | 20,078 | 2013 | 19,429 | 2012 | 18,765 | 2011 | 18,154 | 2010 | 17,674 | 2009 | 17,250 | 2008 | 16,738 | 2007 | 16,252 | 2006 | 15,840 | 2005 | 15,543 | 2004 | 15,339 | 2003 | 15,183 | 2002 | 15,227 | 2001 | 15,464 | 2000 | 15,699 | 1999 | 15,913 | 1998 | 16,161 | 1997 | 16,453 | 1996 | 16,682 | 1995 | 16,866 | 1994 | 17,116 | 1993 | 17,377 | 1992 | 17,369 | 1991 | 17,127 | 1990 | 16,792 | 1989 | 16,307 | 1988 | 15,852 | 1987 | 15,607 | 1986 | 15,402 | 1985 | 15,163 | 1984 | 15,105 | 1983 | 15,046 | 1982 | 14,895 | 1981 | 14,781 | 1980 | 14,607 | 1979 | 14,488 | 1978 | 14,405 | 1977 | 14,188 | 1976 | 13,990 | 1975 | 13,689 | 1974 | 13,296 | 1973 | 12,980 | 1972 | 12,567 | 1971 | 11,924 | 1970 | 11,599 | 1969 | 11,719 | 1968 | 11,797 | 1967 | 11,816 | 1966 | 11,928 | 1965 | 11,987 | 1964 | 11,812 | 1963 | 11,685 | 1962 | 11,700 | 1961 | 11,811 | 1960 | 12,139 |
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