| Year | Value | | 2018 | 8,223,535 | | 2017 | 8,334,180 | | 2016 | 8,420,427 | | 2015 | 8,477,857 | | 2014 | 8,506,358 | | 2013 | 8,502,099 | | 2012 | 8,479,194 | | 2011 | 8,459,644 | | 2010 | 8,456,902 | | 2009 | 8,473,412 | | 2008 | 8,504,387 | | 2007 | 8,548,315 | | 2006 | 8,600,177 | | 2005 | 8,654,623 | | 2004 | 8,722,105 | | 2003 | 8,797,250 | | 2002 | 8,862,405 | | 2001 | 8,892,673 | | 2000 | 8,874,120 | | 1999 | 8,800,724 | | 1998 | 8,675,304 | | 1997 | 8,511,954 | | 1996 | 8,335,032 | | 1995 | 8,161,435 | | 1994 | 7,985,259 | | 1993 | 7,810,604 | | 1992 | 7,645,342 | | 1991 | 7,497,217 | | 1990 | 7,370,004 | | 1989 | 7,279,033 | | 1988 | 7,215,221 | | 1987 | 7,169,906 | | 1986 | 7,130,009 | | 1985 | 7,087,047 | | 1984 | 7,034,827 | | 1983 | 6,977,072 | | 1982 | 6,907,236 | | 1981 | 6,818,678 | | 1980 | 6,709,172 | | 1979 | 6,566,368 | | 1978 | 6,396,558 | | 1977 | 6,210,041 | | 1976 | 6,023,250 | | 1975 | 5,846,474 | | 1974 | 5,678,921 | | 1973 | 5,524,180 | | 1972 | 5,376,272 | | 1971 | 5,223,678 | | 1970 | 5,059,625 | | 1969 | 4,889,167 | | 1968 | 4,711,734 | | 1967 | 4,530,517 | | 1966 | 4,352,445 | | 1965 | 4,183,299 | | 1964 | 4,007,838 | | 1963 | 3,835,049 | | 1962 | 3,673,136 | | 1961 | 3,534,637 | | 1960 | 3,427,065 |
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