- 1971: 6,450,304 (May–Oct only)
- 1972: 15,848,327
- 1973: 16,958,056
- 1974: 18,670,319
- 1975: 17,269,000 (estimated Oct–Dec)
- 1976: 18,046,136
- 1977: 18,961,876
- 1978: 18,922,652
- 1979: 21,406,768
- 1980: 21,219,149
- 1981: 20,609,944
- 1982: 19,042,325
- 1983: 19,038,563
- 1984: 19,943,075
- 1985: 20,776,091
- 1986: 20,327,909
- 1987: 20,414,614
- 1988: 21,496,303
- 1989: 21,363,271
- 1990: 22,186,300
- 1991: 22,062,425
| | - 1992: 21,345,247
- 1993: 22,065,869
- 1994: 21,837,626
- 1995: 20,726,490
- 1996: 19,605,398
- 1997: 20,190,450
- 1998: 21,094,165
- 1999: 21,508,699
- 2000: 20,992,485
- 2001: 21,812,224
- 2002: 21,669,207
- 2003: 22,333,180
- 2004: 23,362,729
- 2005: 24,031,170
- 2006: 24,306,965
- 2007: 25,847,531
- 2008: 28,716,407
- 2009: 27,167,014
- 2010: 28,716,857
- 2011: 30,186,733[9]
- 2012: 31,240,565[10]
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