Year	Number of
1990	1573.71
1991	1636.45
1992	1704.5
1993	1780.21
1994	1867.2
1995	1967.88
1996	2030.56
1997	2100.88
1998	2176.81
1999	2256.93
2000	2341.89
2001	2460.85
2002	2591.6
2003	2735.31
2004	2891.15
2005	3065.43
2006	3203.18
2007	3348.4
2008	3439.04
2009	3633.61
2010	3830.62
2011	4012.44
2012	4216.17
2013	4428.84
2014	4648.26
2015	4878.44
2016	5116.36