Year | Value | 2022 | 18,134,763 | 2021 | 18,836,159 | 2020 | 19,089,084 | 2019 | 19,192,852 | 2018 | 19,183,725 | 2017 | 19,020,079 | 2016 | 18,681,260 | 2015 | 18,350,243 | 2014 | 18,052,718 | 2013 | 17,699,192 | 2012 | 17,361,780 | 2011 | 17,135,043 | 2010 | 16,908,219 | 2009 | 16,667,815 | 2008 | 16,447,770 | 2007 | 16,258,477 | 2006 | 16,090,742 | 2005 | 15,898,573 | 2004 | 15,706,676 | 2003 | 15,585,209 | 2002 | 15,471,186 | 2001 | 15,304,643 | 2000 | 15,191,658 | 1999 | 15,201,112 | 1998 | 15,338,432 | 1997 | 15,593,087 | 1996 | 16,014,771 | 1995 | 16,525,128 | 1994 | 16,980,563 | 1993 | 17,260,467 | 1992 | 17,410,006 | 1991 | 17,412,396 | 1990 | 17,251,639 | 1989 | 17,073,884 | 1988 | 16,859,000 | 1987 | 16,541,637 | 1986 | 16,194,134 | 1985 | 15,871,330 | 1984 | 15,562,244 | 1983 | 15,170,580 | 1982 | 14,703,415 | 1981 | 14,174,121 | 1980 | 13,257,853 | 1979 | 11,987,161 | 1978 | 10,764,971 | 1977 | 9,819,273 | 1976 | 9,440,755 | 1975 | 9,836,033 | 1974 | 10,808,993 | 1973 | 12,051,739 | 1972 | 13,269,032 | 1971 | 13,954,538 | 1970 | 14,070,105 | 1969 | 13,762,068 | 1968 | 13,117,113 | 1967 | 12,482,315 | 1966 | 12,085,403 | 1965 | 12,084,436 | 1964 | 12,379,585 | 1963 | 12,867,144 | 1962 | 13,236,643 | 1961 | 13,305,062 | 1960 | 12,987,220 |
|