Year | Value | 2024 | 23,066 | 2023 | 22,767 | 2022 | 22,303 | 2021 | 21,588 | 2020 | 21,029 | 2019 | 20,965 | 2018 | 21,294 | 2017 | 22,027 | 2016 | 23,154 | 2015 | 24,538 | 2014 | 25,982 | 2013 | 27,384 | 2012 | 28,684 | 2011 | 29,727 | 2010 | 30,227 | 2009 | 30,141 | 2008 | 29,812 | 2007 | 29,467 | 2006 | 29,134 | 2005 | 28,788 | 2004 | 28,367 | 2003 | 27,835 | 2002 | 27,193 | 2001 | 26,464 | 2000 | 25,668 | 1999 | 24,856 | 1998 | 24,109 | 1997 | 23,436 | 1996 | 22,801 | 1995 | 22,197 | 1994 | 21,640 | 1993 | 21,147 | 1992 | 20,733 | 1991 | 20,404 | 1990 | 20,149 | 1989 | 20,017 | 1988 | 20,012 | 1987 | 20,048 | 1986 | 20,081 | 1985 | 20,115 | 1984 | 20,158 | 1983 | 20,159 | 1982 | 20,067 | 1981 | 19,878 | 1980 | 19,554 | 1979 | 19,004 | 1978 | 18,455 | 1977 | 18,143 | 1976 | 18,004 | 1975 | 18,004 |
|