| Year | Value | | 2022 | 16,241,913 | | 2021 | 15,719,483 | | 2020 | 15,197,821 | | 2019 | 14,687,317 | | 2018 | 14,198,726 | | 2017 | 13,750,579 | | 2016 | 13,354,872 | | 2015 | 12,945,684 | | 2014 | 12,484,019 | | 2013 | 12,041,276 | | 2012 | 11,640,831 | | 2011 | 11,267,825 | | 2010 | 10,909,908 | | 2009 | 10,564,548 | | 2008 | 10,239,104 | | 2007 | 9,924,114 | | 2006 | 9,594,991 | | 2005 | 9,251,019 | | 2004 | 8,913,472 | | 2003 | 8,583,368 | | 2002 | 8,268,904 | | 2001 | 7,981,541 | | 2000 | 7,713,426 | | 1999 | 7,458,244 | | 1998 | 7,219,475 | | 1997 | 6,999,254 | | 1996 | 6,775,079 | | 1995 | 6,535,214 | | 1994 | 6,296,648 | | 1993 | 6,065,869 | | 1992 | 5,821,641 | | 1991 | 5,554,687 | | 1990 | 5,285,269 | | 1989 | 4,988,291 | | 1988 | 4,738,971 | | 1987 | 4,512,384 | | 1986 | 4,303,957 | | 1985 | 4,132,144 | | 1984 | 4,004,465 | | 1983 | 3,915,181 | | 1982 | 3,857,721 | | 1981 | 3,808,424 | | 1980 | 3,763,881 | | 1979 | 3,730,507 | | 1978 | 3,702,307 | | 1977 | 3,666,558 | | 1976 | 3,605,387 | | 1975 | 3,536,012 | | 1974 | 3,469,148 | | 1973 | 3,395,069 | | 1972 | 3,315,714 | | 1971 | 3,239,936 | | 1970 | 3,167,800 | | 1969 | 3,096,869 | | 1968 | 3,027,785 | | 1967 | 2,958,975 | | 1966 | 2,882,714 | | 1965 | 2,801,168 | | 1964 | 2,714,959 | | 1963 | 2,625,735 | | 1962 | 2,536,690 | | 1961 | 2,454,406 | | 1960 | 2,381,558 |
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