| Year | Value | | 2022 | 2,429,521 | | 2021 | 2,393,723 | | 2020 | 2,348,712 | | 2019 | 2,288,067 | | 2018 | 2,241,789 | | 2017 | 2,186,916 | | 2016 | 2,138,010 | | 2015 | 2,093,396 | | 2014 | 2,053,946 | | 2013 | 1,998,149 | | 2012 | 1,939,619 | | 2011 | 1,903,241 | | 2010 | 1,883,488 | | 2009 | 1,877,446 | | 2008 | 1,894,155 | | 2007 | 1,926,074 | | 2006 | 1,958,131 | | 2005 | 1,941,624 | | 2004 | 1,876,852 | | 2003 | 1,810,177 | | 2002 | 1,746,038 | | 2001 | 1,691,123 | | 2000 | 1,699,179 | | 1999 | 1,761,172 | | 1998 | 1,808,276 | | 1997 | 1,835,122 | | 1996 | 1,841,854 | | 1995 | 1,827,685 | | 1994 | 1,799,702 | | 1993 | 1,773,411 | | 1992 | 1,759,189 | | 1991 | 1,759,751 | | 1990 | 1,772,999 | | 1989 | 1,783,022 | | 1988 | 1,784,197 | | 1987 | 1,791,177 | | 1986 | 1,797,247 | | 1985 | 1,788,721 | | 1984 | 1,783,273 | | 1983 | 1,791,641 | | 1982 | 1,800,272 | | 1981 | 1,805,761 | | 1980 | 1,818,056 | | 1979 | 1,767,563 | | 1978 | 1,621,944 | | 1977 | 1,454,608 | | 1976 | 1,319,673 | | 1975 | 1,236,913 | | 1974 | 1,249,894 | | 1973 | 1,367,025 | | 1972 | 1,504,664 | | 1971 | 1,610,858 | | 1970 | 1,663,341 | | 1969 | 1,676,500 | | 1968 | 1,668,855 | | 1967 | 1,643,428 | | 1966 | 1,610,056 | | 1965 | 1,571,577 | | 1964 | 1,527,461 | | 1963 | 1,478,702 | | 1962 | 1,434,780 | | 1961 | 1,400,077 | | 1960 | 1,370,719 |
|