Year	Number
1971	4885
1972	5544
1973	6054
1974	6922
1986	15861
1988	19376
1989	21983
1991	23319
1992	23705
1993	22600
1994	22470
1995	23605
1996	25984
2008	79962
2009	81887
2010	97660
2011	112608
2012	122147
2020	123323
2021	129033