Year	Number of
1990	1085.4
1991	1177.48
1992	1274.95
1993	1376.77
1994	1490.31
1995	1619.6
1996	1742.81
1997	1878.97
1998	2045.81
1999	2222.92
2000	2413.04
2001	2612.07
2002	2828.69
2003	3081.87
2004	3357.87
2005	3657.58
2006	3935.08
2007	4231.04
2008	4536.32
2009	4863.7
2010	5221.08
2011	5495.64
2012	5805.49
2013	6135.54
2014	6510.06
2015	6933.43
2016	7411.29