Year	Number
1971	363
1972	471
1973	713
1974	870
1975	999
1979	2161
1980	2582
1983	3588
1984	3735
1985	3925
1986	4237
1987	4724
1988	5008
1989	6875
1990	7614
1991	8565
1992	9430
1993	10537
1994	11637
1995	12577
2016	46237
2019	53167
2020	70510