| Year | Value | | 2022 | 17,298,456 | | 2021 | 16,963,395 | | 2020 | 16,652,289 | | 2019 | 16,335,954 | | 2018 | 16,086,312 | | 2017 | 15,885,786 | | 2016 | 15,627,288 | | 2015 | 15,283,302 | | 2014 | 14,862,293 | | 2013 | 14,363,179 | | 2012 | 13,832,566 | | 2011 | 13,352,640 | | 2010 | 12,967,745 | | 2009 | 12,653,889 | | 2008 | 12,378,677 | | 2007 | 12,100,488 | | 2006 | 11,801,615 | | 2005 | 11,483,014 | | 2004 | 11,150,520 | | 2003 | 10,812,892 | | 2002 | 10,463,056 | | 2001 | 10,107,293 | | 2000 | 9,736,970 | | 1999 | 9,363,081 | | 1998 | 9,008,035 | | 1997 | 8,659,519 | | 1996 | 8,328,924 | | 1995 | 8,065,873 | | 1994 | 7,877,572 | | 1993 | 7,729,267 | | 1992 | 7,630,425 | | 1991 | 7,555,786 | | 1990 | 7,447,807 | | 1989 | 7,289,517 | | 1988 | 7,098,685 | | 1987 | 6,888,785 | | 1986 | 6,667,966 | | 1985 | 6,459,225 | | 1984 | 6,247,409 | | 1983 | 6,035,330 | | 1982 | 5,824,987 | | 1981 | 5,617,067 | | 1980 | 5,423,700 | | 1979 | 5,250,876 | | 1978 | 5,085,499 | | 1977 | 4,924,488 | | 1976 | 4,763,556 | | 1975 | 4,592,736 | | 1974 | 4,409,688 | | 1973 | 4,211,171 | | 1972 | 4,008,619 | | 1971 | 3,828,759 | | 1970 | 3,696,477 | | 1969 | 3,607,480 | | 1968 | 3,571,642 | | 1967 | 3,569,519 | | 1966 | 3,548,433 | | 1965 | 3,482,508 | | 1964 | 3,371,841 | | 1963 | 3,197,183 | | 1962 | 2,993,621 | | 1961 | 2,815,290 | | 1960 | 2,677,035 |
|