| Year | Value | | 2022 | 4,259,528 | | 2021 | 4,189,606 | | 2020 | 4,115,703 | | 2019 | 4,040,715 | | 2018 | 3,968,124 | | 2017 | 3,895,863 | | 2016 | 3,824,264 | | 2015 | 3,753,105 | | 2014 | 3,683,303 | | 2013 | 3,615,222 | | 2012 | 3,548,485 | | 2011 | 3,482,053 | | 2010 | 3,418,538 | | 2009 | 3,360,926 | | 2008 | 3,308,734 | | 2007 | 3,258,272 | | 2006 | 3,207,898 | | 2005 | 3,156,489 | | 2004 | 3,103,824 | | 2003 | 3,050,124 | | 2002 | 2,992,166 | | 2001 | 2,916,691 | | 2000 | 2,835,060 | | 1999 | 2,748,887 | | 1998 | 2,661,321 | | 1997 | 2,573,641 | | 1996 | 2,486,529 | | 1995 | 2,400,068 | | 1994 | 2,314,541 | | 1993 | 2,230,121 | | 1992 | 2,146,481 | | 1991 | 2,060,616 | | 1990 | 1,976,584 | | 1989 | 1,894,603 | | 1988 | 1,814,843 | | 1987 | 1,737,275 | | 1986 | 1,662,464 | | 1985 | 1,590,373 | | 1984 | 1,521,164 | | 1983 | 1,454,726 | | 1982 | 1,391,230 | | 1981 | 1,336,019 | | 1980 | 1,283,537 | | 1979 | 1,233,989 | | 1978 | 1,187,236 | | 1977 | 1,142,569 | | 1976 | 1,099,637 | | 1975 | 1,058,203 | | 1974 | 1,018,108 | | 1973 | 979,431 | | 1972 | 942,943 | | 1971 | 917,264 | | 1970 | 892,817 | | 1969 | 869,040 | | 1968 | 845,598 | | 1967 | 822,439 | | 1966 | 799,481 | | 1965 | 776,743 | | 1964 | 754,354 | | 1963 | 732,467 | | 1962 | 711,620 | | 1961 | 692,429 | | 1960 | 673,972 |
|