Year	Number of
1990	62.37
1991	65.37
1992	69.19
1993	73.94
1994	79.92
1995	91.22
1996	95.81
1997	100.75
1998	106.28
1999	112.73
2000	120.37
2001	125.74
2002	131.91
2003	138.8
2004	146.2
2005	154.08
2006	158.68
2007	163.29
2008	168.2
2009	173.31
2010	178.7
2011	182.83
2012	187.3
2013	192.12
2014	197.05
2015	202.07
2016	206.93