Year	Number
1980	2355
1981	2069
1982	2131
1983	208
1984	2473
1985	2670
1986	2677
1987	2708
1988	2705
1989	2770
1990	3356
1991	2999
1992	2963
1993	3279
1994	3933
1995	5973
1996	7945
1997	9590
1998	8324
1999	4157
2000	7979
2001	9853
2002	10277
2003	10707
2004	14923
2005	21307
2006	25447
2007	30920
2008	32304
2009	27500
2010	32400
2011	34830
2012	35501
2013	33592
2014	31875
2015	34396
2016	33081
2017	32679
2018	34920
2019	35351
2020	34811