Year	Number of
1990	441.29
1991	454.33
1992	468.46
1993	483.68
1994	499.89
1995	517.33
1996	525.82
1997	535.39
1998	546.06
1999	557.28
2000	569.14
2001	587.58
2002	607.2
2003	628.57
2004	650.82
2005	674.23
2006	704.69
2007	736.59
2008	771.23
2009	807.9
2010	846.94
2011	882.8
2012	921.03
2013	961.54
2014	1004.22
2015	1049.04
2016	1094.12