Year	Number of
1990	1431.5
1991	1535.25
1992	1657.63
1993	1807.4
1994	1998.13
1995	2385.37
1996	2589.76
1997	2827.01
1998	3102.44
1999	3415.58
2000	3776.97
2001	4000.01
2002	4238.63
2003	4500.7
2004	4789.67
2005	5110
2006	5519.31
2007	5977.4
2008	6483.84
2009	7042.87
2010	7661.98
2011	8120.74
2012	8618.65
2013	9151.43
2014	9726.55
2015	10348.19
2016	11041.83