Year	Number
1982	32250
1983	34950
1984	37650
1985	40350
1990	42716
1991	40548
1992	40808
1993	42369
1994	38453
1995	34235
1996	27943
1997	26245
1999	32476
2000	22972
2001	22804
2002	22999
2003	22647
2004	29661
2005	34588
2006	38069
2007	37053
2008	38439
2009	39760
2010	35513
2011	33445
2012	32712
2013	32781
2014	31194
2015	30819
2016	30296
2017	32869
2018	30801