| Year | Value | | 2018 | 1,770,056 | | 2017 | 1,725,740 | | 2016 | 1,680,803 | | 2015 | 1,636,969 | | 2014 | 1,595,250 | | 2013 | 1,552,147 | | 2012 | 1,511,030 | | 2011 | 1,476,903 | | 2010 | 1,452,630 | | 2009 | 1,440,719 | | 2008 | 1,438,848 | | 2007 | 1,443,191 | | 2006 | 1,447,521 | | 2005 | 1,447,517 | | 2004 | 1,444,741 | | 2003 | 1,437,742 | | 2002 | 1,424,444 | | 2001 | 1,402,073 | | 2000 | 1,369,348 | | 1999 | 1,331,234 | | 1998 | 1,281,223 | | 1997 | 1,225,213 | | 1996 | 1,172,829 | | 1995 | 1,130,181 | | 1994 | 1,097,458 | | 1993 | 1,074,181 | | 1992 | 1,055,974 | | 1991 | 1,035,113 | | 1990 | 1,006,758 | | 1989 | 970,811 | | 1988 | 929,528 | | 1987 | 885,738 | | 1986 | 842,567 | | 1985 | 801,612 | | 1984 | 763,219 | | 1983 | 726,128 | | 1982 | 691,386 | | 1981 | 660,845 | | 1980 | 635,713 | | 1979 | 614,235 | | 1978 | 598,007 | | 1977 | 585,511 | | 1976 | 574,331 | | 1975 | 562,796 | | 1974 | 550,378 | | 1973 | 537,376 | | 1972 | 524,796 | | 1971 | 512,991 | | 1970 | 501,592 | | 1969 | 490,895 | | 1968 | 479,536 | | 1967 | 467,363 | | 1966 | 454,762 | | 1965 | 442,295 | | 1964 | 431,428 | | 1963 | 420,091 | | 1962 | 408,544 | | 1961 | 397,042 | | 1960 | 385,807 |
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