Year	Number of
1990	476.56
1991	483.65
1992	499.77
1993	534.39
1994	546.21
1995	500.53
1996	433.01
1997	408.49
1998	414.57
1999	383.8
2000	372.45
2001	384.56
2002	377.55
2003	370.83
2004	371.25
2005	388.08
2006	399.73
2007	395.1
2008	376.34
2009	355.56
2010	351.17
2011	339.71
2012	340.25
2013	331.76
2014	322.42
2015	320.98
2016	321.51