| Year | Value | | 2022 | 15,596,890 | | 2021 | 15,045,913 | | 2020 | 14,512,408 | | 2019 | 13,999,751 | | 2018 | 13,537,495 | | 2017 | 13,158,979 | | 2016 | 12,833,407 | | 2015 | 12,534,358 | | 2014 | 12,267,929 | | 2013 | 12,009,955 | | 2012 | 11,724,258 | | 2011 | 11,389,659 | | 2010 | 11,033,136 | | 2009 | 10,678,216 | | 2008 | 10,335,256 | | 2007 | 9,998,715 | | 2006 | 9,662,745 | | 2005 | 9,356,060 | | 2004 | 9,084,762 | | 2003 | 8,830,408 | | 2002 | 8,576,618 | | 2001 | 8,319,986 | | 2000 | 8,077,400 | | 1999 | 7,834,664 | | 1998 | 7,567,754 | | 1997 | 7,293,972 | | 1996 | 7,036,510 | | 1995 | 6,808,580 | | 1994 | 6,608,901 | | 1993 | 6,429,479 | | 1992 | 6,283,172 | | 1991 | 6,188,324 | | 1990 | 6,104,839 | | 1989 | 5,995,516 | | 1988 | 5,881,778 | | 1987 | 5,762,533 | | 1986 | 5,633,968 | | 1985 | 5,510,551 | | 1984 | 5,391,496 | | 1983 | 5,275,709 | | 1982 | 5,168,824 | | 1981 | 5,083,376 | | 1980 | 5,016,153 | | 1979 | 4,933,186 | | 1978 | 4,822,384 | | 1977 | 4,711,769 | | 1976 | 4,611,154 | | 1975 | 4,512,469 | | 1974 | 4,417,469 | | 1973 | 4,320,090 | | 1972 | 4,224,274 | | 1971 | 4,130,464 | | 1970 | 4,034,765 | | 1969 | 3,940,361 | | 1968 | 3,848,127 | | 1967 | 3,757,121 | | 1966 | 3,667,122 | | 1965 | 3,578,432 | | 1964 | 3,491,198 | | 1963 | 3,404,567 | | 1962 | 3,318,244 | | 1961 | 3,233,634 | | 1960 | 3,150,965 |
|