Year | Value | 2022 | 31,870 | 2021 | 32,276 | 2020 | 32,592 | 2019 | 32,636 | 2018 | 32,530 | 2017 | 32,528 | 2016 | 32,475 | 2015 | 32,271 | 2014 | 32,079 | 2013 | 31,846 | 2012 | 31,395 | 2011 | 30,782 | 2010 | 30,368 | 2009 | 30,140 | 2008 | 29,974 | 2007 | 29,832 | 2006 | 29,727 | 2005 | 29,742 | 2004 | 29,949 | 2003 | 30,373 | 2002 | 31,035 | 2001 | 31,806 | 2000 | 32,529 | 1999 | 33,223 | 1998 | 33,948 | 1997 | 34,559 | 1996 | 34,867 | 1995 | 34,891 | 1994 | 34,637 | 1993 | 34,032 | 1992 | 33,617 | 1991 | 33,742 | 1990 | 33,979 | 1989 | 34,146 | 1988 | 34,263 | 1987 | 34,272 | 1986 | 34,050 | 1985 | 33,534 | 1984 | 32,711 | 1983 | 31,553 | 1982 | 30,309 | 1981 | 29,387 | 1980 | 28,694 | 1979 | 28,118 | 1978 | 27,789 | 1977 | 27,553 | 1976 | 27,324 | 1975 | 27,408 | 1974 | 27,666 | 1973 | 27,716 | 1972 | 27,924 | 1971 | 28,426 | 1970 | 29,007 | 1969 | 29,676 | 1968 | 30,423 | 1967 | 31,224 | 1966 | 32,028 | 1965 | 33,162 | 1964 | 34,654 | 1963 | 36,040 | 1962 | 37,149 | 1961 | 37,970 | 1960 | 37,681 |
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