| Year | Value | | 2022 | 14,161,931 | | 2021 | 14,010,131 | | 2020 | 13,843,845 | | 2019 | 13,588,808 | | 2018 | 13,322,206 | | 2017 | 13,082,167 | | 2016 | 12,847,978 | | 2015 | 12,595,363 | | 2014 | 12,326,443 | | 2013 | 12,054,035 | | 2012 | 11,818,114 | | 2011 | 11,571,920 | | 2010 | 11,331,042 | | 2009 | 11,038,833 | | 2008 | 10,760,607 | | 2007 | 10,470,518 | | 2006 | 10,156,362 | | 2005 | 9,825,557 | | 2004 | 9,485,428 | | 2003 | 9,164,866 | | 2002 | 8,848,552 | | 2001 | 8,482,271 | | 2000 | 8,106,747 | | 1999 | 7,912,566 | | 1998 | 7,976,434 | | 1997 | 8,139,909 | | 1996 | 8,291,947 | | 1995 | 8,340,873 | | 1994 | 8,212,941 | | 1993 | 7,984,125 | | 1992 | 7,723,731 | | 1991 | 7,469,664 | | 1990 | 7,223,046 | | 1989 | 6,959,304 | | 1988 | 6,688,832 | | 1987 | 6,430,101 | | 1986 | 6,197,168 | | 1985 | 5,987,933 | | 1984 | 5,780,145 | | 1983 | 5,583,197 | | 1982 | 5,382,763 | | 1981 | 5,172,432 | | 1980 | 4,981,891 | | 1979 | 4,796,322 | | 1978 | 4,620,132 | | 1977 | 4,452,546 | | 1976 | 4,292,989 | | 1975 | 4,156,932 | | 1974 | 4,033,442 | | 1973 | 3,909,357 | | 1972 | 3,788,710 | | 1971 | 3,674,473 | | 1970 | 3,571,158 | | 1969 | 3,464,008 | | 1968 | 3,357,057 | | 1967 | 3,250,267 | | 1966 | 3,137,881 | | 1965 | 3,031,476 | | 1964 | 2,918,759 | | 1963 | 2,820,237 | | 1962 | 2,740,828 | | 1961 | 2,646,096 | | 1960 | 2,553,211 |
|