Year | Value | 2021 | 69,447 | 2020 | 31,391 | 2019 | 113,752 | 2016 | 11,903 | 2015 | 14,463 | 2014 | 16,128 | 2013 | 20,004 | 2012 | 28,442.05 | 2011 | 28,232.1 | 2010 | 19,167 | 1999 | 10,400 | 1998 | 33,500 | 1997 | 33,600 | 1996 | 29,500 | 1995 | 67,400 | 1994 | 300,200 | 1993 | 327,900 | 1992 | 322,900 | 1991 | 264,200 | 1990 | 718,000 | 1989 | 479,500 | 1988 | 350,500 | 1987 | 298,700 | 1986 | 614,500 | 1985 | 733,600 | 1984 | 605,000 | 1983 | 446,700 | 1982 | 413,900 | 1981 | 440,300 | 1980 | 466,300 | 1979 | 454,600 | 1978 | 429,600 | 1977 | 424,800 | 1976 | 359,300 | 1975 | 302,100 | 1974 | 160,000 | 1973 | 150,000 | 1972 | 191,500 | 1971 | 182,700 | 1970 | 128,800 |
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