| Year | Value | | 2022 | 32,831,680 | | 2021 | 32,604,541 | | 2020 | 32,194,633 | | 2019 | 31,363,165 | | 2018 | 30,254,215 | | 2017 | 29,073,521 | | 2016 | 27,922,219 | | 2015 | 26,821,711 | | 2014 | 25,771,603 | | 2013 | 24,741,891 | | 2012 | 23,747,283 | | 2011 | 22,808,928 | | 2010 | 21,869,315 | | 2009 | 20,928,824 | | 2008 | 19,982,687 | | 2007 | 19,036,212 | | 2006 | 18,148,107 | | 2005 | 17,289,349 | | 2004 | 16,438,182 | | 2003 | 15,649,473 | | 2002 | 14,952,662 | | 2001 | 14,305,276 | | 2000 | 13,688,904 | | 1999 | 13,113,089 | | 1998 | 12,591,479 | | 1997 | 12,134,532 | | 1996 | 11,729,891 | | 1995 | 11,342,624 | | 1994 | 10,927,484 | | 1993 | 10,494,355 | | 1992 | 10,094,395 | | 1991 | 9,736,210 | | 1990 | 9,396,161 | | 1989 | 9,046,306 | | 1988 | 8,695,760 | | 1987 | 8,360,353 | | 1986 | 8,032,853 | | 1985 | 7,718,598 | | 1984 | 7,423,153 | | 1983 | 7,130,627 | | 1982 | 6,843,635 | | 1981 | 6,573,726 | | 1980 | 6,315,282 | | 1979 | 6,055,283 | | 1978 | 5,788,801 | | 1977 | 5,522,192 | | 1976 | 5,270,916 | | 1975 | 5,036,642 | | 1974 | 4,815,255 | | 1973 | 4,616,958 | | 1972 | 4,448,218 | | 1971 | 4,312,469 | | 1970 | 4,195,954 | | 1969 | 4,070,886 | | 1968 | 3,921,871 | | 1967 | 3,763,341 | | 1966 | 3,622,811 | | 1965 | 3,511,660 | | 1964 | 3,424,684 | | 1963 | 3,360,615 | | 1962 | 3,320,149 | | 1961 | 3,305,975 | | 1960 | 3,319,135 |
|