Year | Value | 2022 | 25,373,321 | 2021 | 25,156,576 | 2020 | 24,987,988 | 2019 | 24,919,624 | 2018 | 24,924,028 | 2017 | 25,036,226 | 2016 | 25,236,367 | 2015 | 25,474,674 | 2014 | 25,784,822 | 2013 | 26,185,572 | 2012 | 26,710,925 | 2011 | 27,395,451 | 2010 | 28,204,693 | 2009 | 29,027,696 | 2008 | 29,854,019 | 2007 | 30,601,949 | 2006 | 31,203,190 | 2005 | 31,587,855 | 2004 | 31,819,643 | 2003 | 31,957,771 | 2002 | 31,942,990 | 2001 | 31,783,732 | 2000 | 31,643,449 | 1999 | 31,524,063 | 1998 | 31,335,960 | 1997 | 31,155,546 | 1996 | 31,051,552 | 1995 | 30,986,963 | 1994 | 30,973,211 | 1993 | 31,003,405 | 1992 | 31,094,835 | 1991 | 31,220,128 | 1990 | 31,257,540 | 1989 | 31,251,300 | 1988 | 31,305,224 | 1987 | 31,376,432 | 1986 | 31,396,934 | 1985 | 31,496,556 | 1984 | 31,741,505 | 1983 | 32,033,698 | 1982 | 32,308,858 | 1981 | 32,595,050 | 1980 | 32,816,461 | 1979 | 32,861,015 | 1978 | 32,748,857 | 1977 | 32,584,068 | 1976 | 32,378,494 | 1975 | 32,131,587 | 1974 | 31,925,693 | 1973 | 31,715,550 | 1972 | 31,386,105 | 1971 | 31,003,755 | 1970 | 30,616,478 | 1969 | 30,249,920 | 1968 | 29,869,562 | 1967 | 29,435,241 | 1966 | 28,899,394 | 1965 | 27,775,797 | 1964 | 26,143,586 | 1963 | 24,553,029 | 1962 | 23,225,379 | 1961 | 22,557,990 | 1960 | 22,992,219 |
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