Year | Value | 2022 | 28,868,163 | 2021 | 29,084,475 | 2020 | 29,193,106 | 2019 | 29,141,420 | 2018 | 28,902,972 | 2017 | 28,602,803 | 2016 | 28,236,430 | 2015 | 27,733,873 | 2014 | 27,229,352 | 2013 | 26,778,676 | 2012 | 26,302,856 | 2011 | 25,844,191 | 2010 | 25,528,133 | 2009 | 25,273,776 | 2008 | 25,016,318 | 2007 | 24,717,958 | 2006 | 24,300,552 | 2005 | 23,340,086 | 2004 | 21,964,016 | 2003 | 20,659,204 | 2002 | 19,545,493 | 2001 | 18,906,317 | 2000 | 19,159,673 | 1999 | 20,004,234 | 1998 | 20,945,081 | 1997 | 21,881,046 | 1996 | 22,435,912 | 1995 | 22,471,480 | 1994 | 22,119,979 | 1993 | 21,482,976 | 1992 | 20,863,377 | 1991 | 20,499,890 | 1990 | 20,460,175 | 1989 | 20,721,895 | 1988 | 21,177,806 | 1987 | 21,526,064 | 1986 | 21,559,434 | 1985 | 21,245,621 | 1984 | 20,632,807 | 1983 | 19,847,270 | 1982 | 18,979,855 | 1981 | 18,186,142 | 1980 | 17,520,065 | 1979 | 16,757,709 | 1978 | 15,754,494 | 1977 | 14,629,505 | 1976 | 13,567,655 | 1975 | 12,826,631 | 1974 | 12,813,747 | 1973 | 13,506,848 | 1972 | 14,541,989 | 1971 | 15,609,004 | 1970 | 16,409,114 | 1969 | 16,790,464 | 1968 | 16,836,814 | 1967 | 16,763,403 | 1966 | 16,662,190 | 1965 | 16,499,235 | 1964 | 16,257,074 | 1963 | 16,005,790 | 1962 | 15,731,681 | 1961 | 15,404,656 | 1960 | 15,084,242 |
|