Year	Number of
1990	1363.96
1991	1400.06
1992	1441.87
1993	1492.08
1994	1554.54
1995	1614.05
1996	1671.21
1997	1740.51
1998	1804.53
1999	1845.72
2000	1910.28
2001	1956.21
2002	2038.66
2003	2119.35
2004	2176.35
2005	2242.48
2006	2273.36
2007	2292.4
2008	2381.19
2009	2460.9
2010	2547.24
2011	2632.78
2012	2724
2013	2835.08
2014	2944.81
2015	3049.44
2016	3189.79