Year	Number
1970	5792671
1971	5975991
1972	5617965
1973	5582917
1974	5617375
1975	5335256
1976	5137073
1977	5027969
1978	4965545
1979	5247698
1980	4923819
1981	5108651
1982	4975857
1983	4958034
1984	4870223
1985	4884842
1986	4814053
1987	4755586
1988	4689498
1989	4807540
1990	4413938
1991	4370707
1992	5076965
1993	5055434
1994	4649053
1995	5021585
1996	4471460
1997	4504918
1998	4469132
1999	4227793
2000	3888721
2001	3371207
2002	2862773
2003	2602116
2004	2412062
2005	2384286
2006	2328479
2007	2064428
2008	1735799
2009	1591361
2010	1304834
2011	1257212
2012	1094522
2013	1308410