Year | Value | 2022 | 20,379,448 | 2021 | 20,007,111 | 2020 | 19,619,219 | 2019 | 19,222,873 | 2018 | 18,834,813 | 2017 | 18,440,146 | 2016 | 18,023,216 | 2015 | 17,609,169 | 2014 | 17,217,312 | 2013 | 16,827,754 | 2012 | 16,444,410 | 2011 | 16,077,251 | 2010 | 15,729,357 | 2009 | 15,407,703 | 2008 | 15,110,145 | 2007 | 14,818,898 | 2006 | 14,477,448 | 2005 | 14,147,982 | 2004 | 13,821,932 | 2003 | 13,500,376 | 2002 | 13,187,976 | 2001 | 12,886,237 | 2000 | 12,598,225 | 1999 | 12,323,774 | 1998 | 12,059,130 | 1997 | 11,807,250 | 1996 | 11,575,188 | 1995 | 11,307,031 | 1994 | 10,888,783 | 1993 | 10,444,580 | 1992 | 10,227,255 | 1991 | 10,104,838 | 1990 | 9,977,594 | 1989 | 10,006,128 | 1988 | 10,086,588 | 1987 | 10,266,171 | 1986 | 10,387,094 | 1985 | 10,356,316 | 1984 | 10,292,392 | 1983 | 10,208,195 | 1982 | 10,112,387 | 1981 | 10,004,476 | 1980 | 9,911,787 | 1979 | 9,718,057 | 1978 | 9,431,033 | 1977 | 9,146,995 | 1976 | 8,887,340 | 1975 | 8,649,033 | 1974 | 8,420,916 | 1973 | 8,206,192 | 1972 | 8,003,678 | 1971 | 7,821,134 | 1970 | 7,655,466 | 1969 | 7,498,615 | 1968 | 7,350,741 | 1967 | 7,207,449 | 1966 | 7,068,704 | 1965 | 6,932,755 | 1964 | 6,800,321 | 1963 | 6,673,037 | 1962 | 6,548,781 | 1961 | 6,429,767 | 1960 | 6,322,149 |
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