Year	Number
1971	4378
1972	4754
1979	8044
1980	8527
1982	11174
1983	12775
1984	14814
1986	17646
1987	18460
1988	20167
1989	21901
1990	23115
1991	23240
1992	23983
1993	24720
1994	25088
1995	25757
1996	26531
1997	27045
1999	28938
2000	29373
2003	32042
2004	33408
2017	50934
2018	54627
2019	57590
2020	56377
2021	57090
2022	61545