2012 16,350,000
2011 16,040,000
2010 15,960,000
2009 16,150,000
2008 16,080,000
2007 15,940,000
2006 15,840,000
2005 16,170,000
2004 15,930,000
2003 15,990,000
2002 16,470,000
2001 17,020,000
2000 13,793,799
1999 11,495,247
1998 14,010,711
1997 14,454,335
1996 15,224,282
1995 16,933,559
1994 16,470,140
1993 17,914,756
1992 18,752,106
1991 20,082,026
1990 26,210,044
1989 25,137,678
1988 24,576,191
1987 25,282,644
1986 23,190,076
1985 20,429,326
1984 20,313,426
1983 20,065,048
1982 23,100,427
1981 19,122,938
1980 18,393,809
1979 18,924,822
1978 18,831,591
1977 17,931,155
1976 20,491,797
1975 21,136,635
1974 22,874,423
1973 23,630,435
1972 24,800,391
1971 25,160,381
1970 28,012,344
1969 25,018,386
1968 27,718,516
1967 21,736,582
1966 24,828,470
1965 24,799,129
1964 24,144,848
1963 27,866,189
1962 20,923,112
1961 11,414,017
1960 14,684,726
1959 13,059,787
1958 17,135,981
1957 18,998,424
1956 17,364,027
1955 18,612,172
1954 18,513,434
1953 16,745,695
1952 17,236,621
1951 14,413,123
1950 14,711,260