| Year | Value | | 2018 | 3,814,900 | | 2017 | 3,686,680 | | 2016 | 3,545,200 | | 2015 | 3,390,863 | | 2014 | 3,220,469 | | 2013 | 3,035,450 | | 2012 | 2,841,738 | | 2011 | 2,648,974 | | 2010 | 2,465,691 | | 2009 | 2,297,761 | | 2008 | 2,135,862 | | 2007 | 1,990,022 | | 2006 | 1,875,747 | | 2005 | 1,803,913 | | 2004 | 1,772,061 | | 2003 | 1,784,860 | | 2002 | 1,826,014 | | 2001 | 1,869,327 | | 2000 | 1,898,398 | | 1999 | 1,909,605 | | 1998 | 1,906,607 | | 1997 | 1,889,728 | | 1996 | 1,862,996 | | 1995 | 1,829,613 | | 1994 | 1,784,228 | | 1993 | 1,726,489 | | 1992 | 1,660,690 | | 1991 | 1,594,294 | | 1990 | 1,533,014 | | 1989 | 1,474,969 | | 1988 | 1,422,571 | | 1987 | 1,376,020 | | 1986 | 1,334,698 | | 1985 | 1,298,763 | | 1984 | 1,273,955 | | 1983 | 1,253,554 | | 1982 | 1,236,530 | | 1981 | 1,221,194 | | 1980 | 1,206,840 | | 1979 | 1,188,177 | | 1978 | 1,168,820 | | 1977 | 1,149,401 | | 1976 | 1,131,055 | | 1975 | 1,115,361 | | 1974 | 1,081,343 | | 1973 | 1,050,119 | | 1972 | 1,021,212 | | 1971 | 993,899 | | 1970 | 967,476 | | 1969 | 942,638 | | 1968 | 917,502 | | 1967 | 891,802 | | 1966 | 865,608 | | 1965 | 839,923 | | 1964 | 811,794 | | 1963 | 783,196 | | 1962 | 755,422 | | 1961 | 731,035 | | 1960 | 712,135 |
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