Year	Number of
1980	45704
1981	49452
1982	48553
1983	65413
1984	69240
1985	77611
1986	52152
1987	51835
1988	50021
1989	44553
1990	46510
1991	43858
1992	47697
1993	49668
1994	47767
1995	45428
1996	39871
1997	30262
1998	15850
1999	29413
2000	34187
2001	49656
2002	49581
2003	54504
2004	55306
2005	57895
2006	57391
2007	54793
2008	55252
2009	63975
2010	67128
2011	65824
2012	60304
2013	63541
2014	67722
2015	62135
2016	70114
2017	80160
2018	85029
2019	87789
2020	85837