Year | Value | 2022 | 51,628,117 | 2021 | 51,744,876 | 2020 | 51,836,239 | 2019 | 51,764,822 | 2018 | 51,585,058 | 2017 | 51,361,911 | 2016 | 51,217,803 | 2015 | 51,014,947 | 2014 | 50,746,659 | 2013 | 50,428,893 | 2012 | 50,199,853 | 2011 | 49,936,638 | 2010 | 49,554,112 | 2009 | 49,307,835 | 2008 | 49,054,708 | 2007 | 48,683,638 | 2006 | 48,438,292 | 2005 | 48,184,561 | 2004 | 48,082,519 | 2003 | 47,892,330 | 2002 | 47,644,736 | 2001 | 47,370,164 | 2000 | 47,008,111 | 1999 | 46,616,677 | 1998 | 46,286,503 | 1997 | 45,953,580 | 1996 | 45,524,681 | 1995 | 45,092,991 | 1994 | 44,641,540 | 1993 | 44,194,628 | 1992 | 43,747,962 | 1991 | 43,295,704 | 1990 | 42,869,283 | 1989 | 42,449,038 | 1988 | 42,031,247 | 1987 | 41,621,690 | 1986 | 41,213,674 | 1985 | 40,805,744 | 1984 | 40,405,956 | 1983 | 39,910,403 | 1982 | 39,326,352 | 1981 | 38,723,248 | 1980 | 38,123,775 | 1979 | 37,534,236 | 1978 | 36,969,185 | 1977 | 36,411,795 | 1976 | 35,848,523 | 1975 | 35,280,725 | 1974 | 34,692,266 | 1973 | 34,103,149 | 1972 | 33,505,406 | 1971 | 32,882,704 | 1970 | 32,240,827 | 1969 | 31,544,266 | 1968 | 30,838,302 | 1967 | 30,130,983 | 1966 | 29,435,571 | 1965 | 28,704,674 | 1964 | 27,984,155 | 1963 | 27,261,747 | 1962 | 26,513,030 | 1961 | 25,765,673 | 1960 | 25,012,374 |
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