| Year | Value | | 2022 | 18,517,389 | | 2021 | 18,219,930 | | 2020 | 18,057,837 | | 2019 | 17,914,106 | | 2018 | 17,719,793 | | 2017 | 17,562,756 | | 2016 | 17,442,496 | | 2015 | 17,368,647 | | 2014 | 17,334,449 | | 2013 | 17,315,526 | | 2012 | 17,303,344 | | 2011 | 17,313,343 | | 2010 | 17,282,267 | | 2009 | 17,096,080 | | 2008 | 16,785,039 | | 2007 | 16,357,957 | | 2006 | 15,843,709 | | 2005 | 15,340,055 | | 2004 | 14,905,470 | | 2003 | 14,524,130 | | 2002 | 14,142,240 | | 2001 | 13,747,535 | | 2000 | 13,336,140 | | 1999 | 12,911,957 | | 1998 | 12,495,370 | | 1997 | 12,096,963 | | 1996 | 11,727,443 | | 1995 | 11,388,731 | | 1994 | 11,061,109 | | 1993 | 10,724,683 | | 1992 | 10,414,122 | | 1991 | 10,151,712 | | 1990 | 9,932,618 | | 1989 | 9,633,044 | | 1988 | 9,398,193 | | 1987 | 9,160,307 | | 1986 | 8,889,921 | | 1985 | 8,594,972 | | 1984 | 8,294,343 | | 1983 | 7,991,375 | | 1982 | 7,686,625 | | 1981 | 7,410,097 | | 1980 | 7,165,094 | | 1979 | 6,918,999 | | 1978 | 6,698,329 | | 1977 | 6,495,187 | | 1976 | 6,256,824 | | 1975 | 6,005,909 | | 1974 | 5,763,670 | | 1973 | 5,531,927 | | 1972 | 5,324,068 | | 1971 | 5,130,357 | | 1970 | 4,943,454 | | 1969 | 4,756,519 | | 1968 | 4,565,887 | | 1967 | 4,377,746 | | 1966 | 4,206,531 | | 1965 | 4,064,230 | | 1964 | 3,953,657 | | 1963 | 3,871,487 | | 1962 | 3,814,132 | | 1961 | 3,770,781 | | 1960 | 3,733,708 |
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