Year | Value | 2022 | 28,968 | 2021 | 29,298 | 2020 | 29,281 | 2019 | 28,929 | 2018 | 28,368 | 2017 | 27,699 | 2016 | 26,999 | 2015 | 26,296 | 2014 | 25,551 | 2013 | 24,770 | 2012 | 23,969 | 2011 | 23,112 | 2010 | 22,215 | 2009 | 21,564 | 2008 | 21,177 | 2007 | 20,791 | 2006 | 20,364 | 2005 | 19,890 | 2004 | 19,383 | 2003 | 18,870 | 2002 | 18,395 | 2001 | 17,982 | 2000 | 17,609 | 1999 | 17,183 | 1998 | 16,731 | 1997 | 16,352 | 1996 | 16,032 | 1995 | 15,779 | 1994 | 15,585 | 1993 | 15,372 | 1992 | 15,087 | 1991 | 14,758 | 1990 | 14,407 | 1989 | 14,040 | 1988 | 13,701 | 1987 | 13,395 | 1986 | 13,103 | 1985 | 12,819 | 1984 | 12,505 | 1983 | 12,140 | 1982 | 11,747 | 1981 | 11,354 | 1980 | 10,925 | 1979 | 10,575 | 1978 | 10,357 | 1977 | 10,138 | 1976 | 9,895 | 1975 | 9,633 | 1974 | 9,408 | 1973 | 9,242 | 1972 | 9,105 | 1971 | 8,939 | 1970 | 8,659 | 1969 | 8,396 | 1968 | 8,269 | 1967 | 8,213 | 1966 | 8,211 | 1965 | 8,246 | 1964 | 8,301 | 1963 | 8,353 | 1962 | 8,382 | 1961 | 8,336 | 1960 | 8,246 |
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