Year	Number of
1990	1201.64
1991	1273.54
1992	1349.63
1993	1433.14
1994	1524.71
1995	1625.9
1996	1735.16
1997	1854.12
1998	1991.87
1999	2139.92
2000	2298.63
2001	2453.04
2002	2617.42
2003	2805.19
2004	2999.16
2005	3199.87
2006	3393.56
2007	3591.83
2008	3810.76
2009	4047.31
2010	4306.84
2011	4552.97
2012	4819.67
2013	5101.21
2014	5399.69
2015	5715.28
2016	6057.05