Year	Number
1970	327
1971	336
1980	998
1981	1217
1982	1870
1983	2756
1994	21409
1995	23889
1996	26701
1997	32463
1998	12281
1999	14988
2000	20010
2001	24607
2002	25365
2003	28612
2004	28878
2018	22765
2019	21293