Year	Number of
1980	750
1981	847
1982	889
1983	293
1984	816
1985	865
1986	358
1987	130
1988	120
1990	632
1991	1466
1992	1665
1993	2691
1994	2564
1995	1955
1996	3241
1997	3160
1998	3270
2000	3760
2001	4673
2002	4793
2003	5289
2004	5710
2005	6737
2006	8041
2007	9418
2008	10786
2009	11524
2010	12859
2011	12734
2012	13074
2013	12072
2014	12477
2015	11861
2016	14114
2017	15935
2018	17144
2019	17794
2020	15706