Year | Value | 2022 | 16,462 | 2021 | 16,703 | 2020 | 16,948 | 2019 | 17,164 | 2018 | 17,296 | 2017 | 17,294 | 2016 | 17,129 | 2015 | 16,822 | 2014 | 16,459 | 2013 | 16,084 | 2012 | 15,735 | 2011 | 15,422 | 2010 | 15,012 | 2009 | 14,633 | 2008 | 14,353 | 2007 | 13,992 | 2006 | 13,543 | 2005 | 13,031 | 2004 | 12,540 | 2003 | 12,167 | 2002 | 11,765 | 2001 | 11,600 | 2000 | 12,379 | 1999 | 13,667 | 1998 | 15,003 | 1997 | 16,162 | 1996 | 17,033 | 1995 | 17,881 | 1994 | 18,847 | 1993 | 19,879 | 1992 | 20,948 | 1991 | 21,737 | 1990 | 22,278 | 1989 | 22,915 | 1988 | 23,688 | 1987 | 24,463 | 1986 | 25,093 | 1985 | 25,542 | 1984 | 25,857 | 1983 | 26,175 | 1982 | 26,443 | 1981 | 26,637 | 1980 | 26,989 | 1979 | 27,417 | 1978 | 27,980 | 1977 | 28,671 | 1976 | 29,146 | 1975 | 29,586 | 1974 | 29,927 | 1973 | 30,135 | 1972 | 30,803 | 1971 | 31,248 | 1970 | 31,194 | 1969 | 31,235 | 1968 | 31,239 | 1967 | 31,261 | 1966 | 31,433 | 1965 | 31,610 | 1964 | 31,616 | 1963 | 31,570 | 1962 | 31,474 | 1961 | 31,403 | 1960 | 31,568 |
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