Year | Value | 2022 | 16,705,485 | 2021 | 16,944,019 | 2020 | 17,214,086 | 2019 | 17,479,118 | 2018 | 17,861,881 | 2017 | 18,073,840 | 2016 | 18,276,159 | 2015 | 18,483,353 | 2014 | 18,679,287 | 2013 | 18,685,173 | 2012 | 18,645,458 | 2011 | 18,737,779 | 2010 | 18,774,936 | 2009 | 18,787,007 | 2008 | 18,770,433 | 2007 | 18,715,453 | 2006 | 18,689,801 | 2005 | 18,702,115 | 2004 | 18,678,509 | 2003 | 18,626,218 | 2002 | 18,611,507 | 2001 | 18,640,786 | 2000 | 18,664,484 | 1999 | 18,690,180 | 1998 | 18,721,181 | 1997 | 18,749,929 | 1996 | 18,774,128 | 1995 | 18,802,959 | 1994 | 18,836,766 | 1993 | 18,867,028 | 1992 | 18,889,575 | 1991 | 18,897,182 | 1990 | 18,872,760 | 1989 | 18,845,634 | 1988 | 18,820,178 | 1987 | 18,799,765 | 1986 | 18,786,528 | 1985 | 18,774,185 | 1984 | 18,757,445 | 1983 | 18,741,940 | 1982 | 18,723,830 | 1981 | 18,737,650 | 1980 | 18,826,343 | 1979 | 18,899,110 | 1978 | 18,956,292 | 1977 | 19,000,219 | 1976 | 19,031,129 | 1975 | 19,047,865 | 1974 | 19,045,214 | 1973 | 19,031,041 | 1972 | 19,012,262 | 1971 | 19,060,905 | 1970 | 19,229,471 | 1969 | 19,385,021 | 1968 | 19,532,729 | 1967 | 19,667,348 | 1966 | 19,781,807 | 1965 | 19,884,509 | 1964 | 19,972,523 | 1963 | 20,063,620 | 1962 | 20,171,158 | 1961 | 20,287,312 | 1960 | 20,400,656 |
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