Year | Value | 2022 | 38,601,659 | 2021 | 38,597,342 | 2020 | 38,525,059 | 2019 | 38,521,814 | 2018 | 38,665,235 | 2017 | 38,748,876 | 2016 | 38,889,785 | 2015 | 38,936,680 | 2014 | 38,680,312 | 2013 | 38,251,326 | 2012 | 37,799,402 | 2011 | 37,332,868 | 2010 | 36,881,412 | 2009 | 36,341,771 | 2008 | 35,775,655 | 2007 | 35,193,648 | 2006 | 34,847,954 | 2005 | 34,490,885 | 2004 | 34,100,485 | 2003 | 34,026,551 | 2002 | 34,092,946 | 2001 | 33,711,820 | 2000 | 32,704,770 | 1999 | 31,476,417 | 1998 | 30,251,278 | 1997 | 28,987,342 | 1996 | 27,925,613 | 1995 | 27,661,072 | 1994 | 27,737,250 | 1993 | 27,528,214 | 1992 | 27,289,261 | 1991 | 27,119,198 | 1990 | 26,811,409 | 1989 | 26,390,475 | 1988 | 26,000,367 | 1987 | 25,664,246 | 1986 | 25,428,061 | 1985 | 25,433,639 | 1984 | 25,710,742 | 1983 | 25,970,453 | 1982 | 26,080,103 | 1981 | 26,015,325 | 1980 | 25,615,218 | 1979 | 24,934,634 | 1978 | 24,357,804 | 1977 | 23,896,285 | 1976 | 23,369,507 | 1975 | 23,010,823 | 1974 | 22,604,426 | 1973 | 21,623,414 | 1972 | 20,371,020 | 1971 | 19,349,232 | 1970 | 18,502,268 | 1969 | 18,237,468 | 1968 | 18,711,400 | 1967 | 19,546,767 | 1966 | 20,324,657 | 1965 | 20,863,107 | 1964 | 21,090,369 | 1963 | 21,088,339 | 1962 | 20,986,335 | 1961 | 20,778,811 | 1960 | 20,533,546 |
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