Year	Number
1970	1588696
1973	480160
1977	613194
1978	694059
1981	1270842
1983	1298604
1984	1715317
1985	1885715
1986	2029669
1987	2160476
1988	1707312
1989	1768291
1990	1660178
2005	625717
2006	632001
2008	728814
2009	881658
2010	840144