Year	Number of
1990	156.88
1991	166.22
1992	175.7
1993	186.2
1994	197.05
1995	208.41
1996	221.45
1997	235.03
1998	250.77
1999	267.36
2000	285.19
2001	305.37
2002	327.99
2003	353.45
2004	381.16
2005	411.12
2006	451.26
2007	495.42
2008	544.33
2009	600.35
2010	665.74
2011	740.17
2012	827.98
2013	929.06
2014	1047.18
2015	1185.83
2016	1352.02