Year	Number of
1990	1641.31
1991	1803.1
1992	1993.28
1993	2211.28
1994	2470.02
1995	2808.07
1996	3053.68
1997	3303.52
1998	3520
1999	3723.07
2000	3926.17
2001	4050.57
2002	4251.72
2003	4469.11
2004	4714.56
2005	4977.4
2006	5191.69
2007	5429.56
2008	5716.24
2009	6011.44
2010	6328.43
2011	6710.08
2012	7138.06
2013	7667.35
2014	8212.13
2015	8777.4
2016	9375.06