| Year | Value | | 2024 | 2,445,200 | | 2023 | 2,397,795 | | 2022 | 2,372,442 | | 2021 | 2,364,130 | | 2020 | 2,329,444 | | 2019 | 2,273,951 | | 2018 | 2,219,238 | | 2017 | 2,161,594 | | 2016 | 2,102,419 | | 2015 | 2,045,874 | | 2014 | 1,975,370 | | 2013 | 1,893,977 | | 2012 | 1,814,986 | | 2011 | 1,722,811 | | 2010 | 1,636,054 | | 2009 | 1,562,226 | | 2008 | 1,480,475 | | 2007 | 1,423,665 | | 2006 | 1,375,561 | | 2005 | 1,302,470 | | 2004 | 1,240,415 | | 2003 | 1,181,875 | | 2002 | 1,100,993 | | 2001 | 1,038,886 | | 2000 | 1,031,422 | | 1999 | 1,025,305 | | 1998 | 996,863 | | 1997 | 970,129 | | 1996 | 943,505 | | 1995 | 914,079 | | 1994 | 876,852 | | 1993 | 811,454 | | 1992 | 724,043 | | 1991 | 668,825 | | 1990 | 658,372 | | 1989 | 647,599 | | 1988 | 626,013 | | 1987 | 615,280 | | 1986 | 612,824 | | 1985 | 608,560 | | 1984 | 591,581 | | 1983 | 573,349 | | 1982 | 573,865 | | 1981 | 619,944 | | 1980 | 681,049 | | 1979 | 703,721 | | 1978 | 699,203 | | 1977 | 683,313 | | 1976 | 667,106 | | 1975 | 650,647 |
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