Year	Number of
1990	1773.03
1991	1869.69
1992	1974.6
1993	2088.46
1994	2210.11
1995	2340.5
1996	2516.21
1997	2706.26
1998	2912.65
1999	3138.65
2000	3388.05
2001	3508.24
2002	3639.85
2003	3781.01
2004	3929.83
2005	4086
2006	4208.19
2007	4331.15
2008	4459.75
2009	4597.11
2010	4745.88
2011	4924.04
2012	5118.95
2013	5328.6
2014	5551.35
2015	5786.79
2016	6028.75