| Year | Value | | 2018 | 1,504,404 | | 2017 | 1,479,791 | | 2016 | 1,450,869 | | 2015 | 1,418,647 | | 2014 | 1,377,139 | | 2013 | 1,330,801 | | 2012 | 1,282,235 | | 2011 | 1,235,457 | | 2010 | 1,192,980 | | 2009 | 1,154,734 | | 2008 | 1,121,717 | | 2007 | 1,091,531 | | 2006 | 1,059,903 | | 2005 | 1,024,132 | | 2004 | 982,845 | | 2003 | 937,798 | | 2002 | 890,940 | | 2001 | 845,381 | | 2000 | 803,210 | | 1999 | 764,927 | | 1998 | 729,760 | | 1997 | 697,975 | | 1996 | 669,733 | | 1995 | 645,084 | | 1994 | 622,395 | | 1993 | 603,122 | | 1992 | 586,608 | | 1991 | 571,789 | | 1990 | 557,887 | | 1989 | 544,030 | | 1988 | 531,176 | | 1987 | 518,833 | | 1986 | 506,381 | | 1985 | 493,466 | | 1984 | 479,511 | | 1983 | 464,724 | | 1982 | 449,549 | | 1981 | 434,897 | | 1980 | 421,398 | | 1979 | 406,898 | | 1978 | 393,106 | | 1977 | 379,872 | | 1976 | 366,944 | | 1975 | 354,247 | | 1974 | 342,223 | | 1973 | 330,537 | | 1972 | 319,637 | | 1971 | 310,130 | | 1970 | 302,325 | | 1969 | 295,262 | | 1968 | 290,170 | | 1967 | 286,163 | | 1966 | 281,841 | | 1965 | 276,337 | | 1964 | 268,594 | | 1963 | 259,211 | | 1962 | 248,950 | | 1961 | 239,086 | | 1960 | 230,466 |
|