Year | Value | 2021 | 325,159.145 | 2020 | 215,962.9134 | 2019 | 417,461.09 | 2018 | 410,069 | 2017 | 383,488 | 2016 | 341,547 | 2015 | 345,543 | 2014 | 346,254.15291316 | 2013 | 329,263.772 | 2012 | 311,610.29055951 | 2011 | 307,977.71707607 | 2010 | 266,822.28924497 | 2001 | 137,114 | 2000 | 143,612 | 1999 | 145,800 | 1998 | 152,500 | 1997 | 159,000 | 1996 | 154,100 | 1995 | 137,800 | 1994 | 143,800 | 1993 | 149,400 | 1992 | 163,700 | 1991 | 174,100 | 1990 | 178,500 | 1989 | 180,200 | 1988 | 183,300 | 1987 | 178,500 | 1986 | 176,500 | 1985 | 192,800 | 1984 | 198,600 | 1983 | 198,200 | 1982 | 200,600 | 1981 | 207,700 | 1980 | 209,300 | 1979 | 206,900 | 1978 | 198,400 | 1977 | 188,500 | 1976 | 210,200 | 1975 | 200,500 | 1974 | 174,400 | 1973 | 180,600 | 1972 | 178,200 | 1971 | 186,500 | 1970 | 187,100 |
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