Year | Value | 2022 | 37,991,563 | 2021 | 37,567,331 | 2020 | 37,124,077 | 2019 | 36,500,637 | 2018 | 35,881,713 | 2017 | 35,250,684 | 2016 | 34,797,391 | 2015 | 34,253,918 | 2014 | 33,648,282 | 2013 | 33,352,999 | 2012 | 33,248,744 | 2011 | 32,789,344 | 2010 | 31,801,267 | 2009 | 30,581,067 | 2008 | 29,331,595 | 2007 | 27,996,330 | 2006 | 26,824,071 | 2005 | 26,370,522 | 2004 | 26,228,940 | 2003 | 25,819,051 | 2002 | 25,408,878 | 2001 | 25,159,981 | 2000 | 24,865,710 | 1999 | 24,492,616 | 1998 | 24,209,677 | 1997 | 23,979,904 | 1996 | 23,780,610 | 1995 | 23,705,168 | 1994 | 23,803,800 | 1993 | 23,855,295 | 1992 | 23,784,727 | 1991 | 23,594,642 | 1990 | 23,166,986 | 1989 | 22,557,249 | 1988 | 22,050,838 | 1987 | 21,649,678 | 1986 | 21,198,533 | 1985 | 20,884,089 | 1984 | 20,517,308 | 1983 | 19,620,559 | 1982 | 18,476,995 | 1981 | 17,529,905 | 1980 | 16,718,783 | 1979 | 16,367,861 | 1978 | 16,733,947 | 1977 | 17,473,646 | 1976 | 18,144,234 | 1975 | 18,602,426 | 1974 | 18,783,424 | 1973 | 18,749,369 | 1972 | 18,623,025 | 1971 | 18,408,275 | 1970 | 18,142,479 | 1969 | 17,876,992 | 1968 | 17,526,330 | 1967 | 17,211,301 | 1966 | 16,955,451 | 1965 | 16,662,552 | 1964 | 16,332,077 | 1963 | 16,022,263 | 1962 | 15,630,258 | 1961 | 15,156,854 | 1960 | 14,711,084 |
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