Year	Number
1971	172138
1972	151907
1973	134442
1974	120527
1975	161558
1976	75517
1977	94761
1978	102749
1979	21338
1980	16556
1981	44873
1983	105492
1985	104160
1986	98083
1987	70747
1988	69972
1989	67530
1993	293825
1996	352233
1999	77349
2000	102585
2004	22439
2007	52595