| Year | Value | | 2022 | 15,505,006 | | 2021 | 15,242,880 | | 2020 | 14,940,079 | | 2019 | 14,575,944 | | 2018 | 14,164,335 | | 2017 | 13,737,300 | | 2016 | 13,311,806 | | 2015 | 12,888,601 | | 2014 | 12,466,745 | | 2013 | 12,052,599 | | 2012 | 11,648,031 | | 2011 | 11,255,049 | | 2010 | 10,879,917 | | 2009 | 10,523,503 | | 2008 | 10,146,485 | | 2007 | 9,758,800 | | 2006 | 9,371,052 | | 2005 | 8,980,080 | | 2004 | 8,600,172 | | 2003 | 8,259,814 | | 2002 | 7,962,988 | | 2001 | 7,700,531 | | 2000 | 7,470,462 | | 1999 | 7,265,665 | | 1998 | 7,076,542 | | 1997 | 6,894,778 | | 1996 | 6,718,027 | | 1995 | 6,545,431 | | 1994 | 6,377,195 | | 1993 | 6,219,226 | | 1992 | 6,075,390 | | 1991 | 5,942,442 | | 1990 | 5,818,554 | | 1989 | 5,703,257 | | 1988 | 5,589,156 | | 1987 | 5,469,041 | | 1986 | 5,341,500 | | 1985 | 5,206,326 | | 1984 | 5,062,545 | | 1983 | 4,910,037 | | 1982 | 4,752,040 | | 1981 | 4,593,719 | | 1980 | 4,438,578 | | 1979 | 4,285,796 | | 1978 | 4,135,109 | | 1977 | 3,992,435 | | 1976 | 3,865,852 | | 1975 | 3,759,178 | | 1974 | 3,670,932 | | 1973 | 3,598,709 | | 1972 | 3,536,706 | | 1971 | 3,475,183 | | 1970 | 3,406,760 | | 1969 | 3,327,729 | | 1968 | 3,236,933 | | 1967 | 3,137,619 | | 1966 | 3,036,074 | | 1965 | 2,936,674 | | 1964 | 2,841,765 | | 1963 | 2,753,955 | | 1962 | 2,673,629 | | 1961 | 2,597,912 | | 1960 | 2,524,593 |
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