Year	Number of
1990	946.24
1991	1026.42
1992	1112.38
1993	1198.64
1994	1292.07
1995	1391.9
1996	1516.66
1997	1652.85
1998	1802.75
1999	1962.79
2000	2135.54
2001	2273.63
2002	2417.51
2003	2570.19
2004	2730.87
2005	2894.04
2006	3044.8
2007	3208.86
2008	3378.53
2009	3562.07
2010	3757.35
2011	3935.18
2012	4134.46
2013	4354.22
2014	4592.47
2015	4834.93
2016	5086.74