Year | Value | 2021 | 271,314 | 2019 | 321,243 | 2018 | 411,989 | 2017 | 248,964 | 2016 | 275,587 | 2015 | 276,689 | 2014 | 239,124 | 2013 | 372,972 | 2012 | 422,016.88764492 | 2011 | 423,655.32558716 | 2010 | 501,520 | 1993 | 602,200 | 1992 | 437,500 | 1991 | 447,300 | 1990 | 609,700 | 1989 | 573,900 | 1988 | 482,300 | 1987 | 425,500 | 1986 | 319,600 | 1985 | 451,000 | 1984 | 439,500 | 1983 | 435,900 | 1982 | 377,000 | 1981 | 410,600 | 1980 | 507,800 | 1979 | 414,200 | 1978 | 359,800 | 1977 | 324,400 | 1976 | 288,700 | 1975 | 298,600 | 1974 | 315,800 | 1973 | 280,400 | 1972 | 240,600 | 1971 | 269,900 | 1970 | 295,600 |
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