Year	Number of
1990	2205.37
1991	2293.59
1992	2397.74
1993	2488.53
1994	2575.56
1995	2666.38
1996	2751.55
1997	2859.75
1998	2978.9
1999	3128.15
2000	3246.49
2001	3342.34
2002	3459.34
2003	3573.74
2004	3682.16
2005	3820.02
2006	3955.16
2007	4107.14
2008	4275.23
2009	4437.03
2010	4604.36
2011	4799.62
2012	4954.91
2013	5116.88
2014	5286.96
2015	5467.94
2016	5649.47