Year	Number of
1990	206.85
1991	213.07
1992	219.47
1993	226.12
1994	233.49
1995	241.9
1996	247.94
1997	254.48
1998	261.48
1999	269.02
2000	277.27
2001	283.14
2002	288.78
2003	294.07
2004	300.88
2005	309.08
2006	312.21
2007	315.16
2008	318.17
2009	321.55
2010	325.41
2011	333.67
2012	341.94
2013	350.45
2014	360.69
2015	372.26
2016	384.5