Year	Number of
1980	1058
1981	1170
1982	497
1983	2029
1986	1392
1987	1464
1988	3066
1989	1045
1990	14740
1991	19016
1992	20662
1993	21579
1994	26994
1995	25316
1996	27196
1997	28349
1998	29228
1999	31597
2000	30372
2001	36829
2002	40695
2003	42891
2004	43721
2005	41040
2006	40782
2007	40909
2008	42178
2009	41703
2010	42885
2011	46306
2012	44663
2013	45549
2014	44187
2015	41912
2016	43413
2017	45794
2018	55835
2019	65897
2020	60887