Year	Number
1985	9500
1986	9000
1987	22000
1988	22000
1989	22300
1990	22300
1991	22300
1992	22300
1993	22300
1994	22300
1995	22300
1996	23000
1997	24600
1998	24500
1999	33500
2000	35054
2001	35054
2002	34496
2003	35680
2004	40076
2005	43282
2006	47585
2007	50440
2008	51921
2009	50716
2018	36660
2019	41933
2020	20703
2021	28019