Year	Number of
1990	861.43
1991	944.89
1992	1033.32
1993	1124.8
1994	1226.14
1995	1340.16
1996	1459.03
1997	1616.15
1998	1812.68
1999	1945.44
2000	2121.22
2001	2273.21
2002	2410.76
2003	2545.97
2004	2701.46
2005	2864
2006	3005.66
2007	3157.87
2008	3277.82
2009	3412.61
2010	3586.79
2011	3768.2
2012	3955.6
2013	4146.65
2014	4341.24
2015	4532.19
2016	4709.51