| Year | Value | | 2021 | 571,070.076 | | 2020 | 511,637 | | 2019 | 1,215,983 | | 2018 | 1,250,460 | | 2017 | 1,443,818 | | 2016 | 1,359,442 | | 2015 | 1,322,033 | | 2014 | 1,290,419 | | 2013 | 1,263,297.3368634 | | 2012 | 1,280,198.1855771 | | 2011 | 1,245,743.6157971 | | 2010 | 1,234,528.619256 | | 2009 | 1,198,381 | | 2008 | 1,200,361 | | 2007 | 1,188,947 | | 2006 | 1,042,100 | | 2005 | 1,018,480 | | 2004 | 988,755 | | 2003 | 1,036,092 | | 2002 | 263,906 | | 2001 | 982,013 | | 2000 | 963,468 | | 1999 | 319,600 | | 1998 | 317,800 | | 1997 | 310,800 | | 1996 | 305,800 | | 1995 | 282,800 | | 1994 | 253,500 | | 1993 | 243,700 | | 1992 | 258,700 | | 1991 | 257,800 | | 1990 | 346,800 | | 1989 | 370,200 | | 1988 | 380,900 | | 1987 | 333,800 | | 1986 | 343,000 | | 1985 | 351,900 | | 1984 | 343,600 | | 1983 | 325,300 | | 1982 | 344,000 | | 1981 | 383,600 | | 1980 | 382,000 | | 1979 | 357,700 | | 1978 | 349,200 | | 1977 | 348,000 | | 1976 | 352,900 | | 1975 | 363,800 | | 1974 | 371,900 | | 1973 | 348,900 | | 1972 | 291,400 | | 1971 | 292,500 | | 1970 | 305,200 |
|