Year	Number of
1980	71685
1981	71554
1982	41752
1983	52502
1984	18784
1985	10742
1986	14351
1987	18091
1988	16051
1989	14386
1990	4332
1991	23067
1997	1290
1998	3084
1999	3314
2000	7107
2001	10139
2002	13794
2003	13808
2004	18404
2005	21844
2006	25475
2007	28769
2008	28301
2009	26150
2010	28029
2011	27983
2012	28679
2013	30507
2014	31746
2015	35878
2016	41954
2017	46640
2018	48420
2019	52438
2020	45818