Year	Count(1000s)
1971	420
1973	656
1975	767
1977	1042
1979	1076
1981	976
1983	1251
1985	1349
1987	1190
1989	954
1991	1198
1993	1327
1995	1395
1997	1536
1999	1714
2001	1266
2003	932
2005	1189
2007	877
2009	556