Year	Number of
1990	201.38
1991	219.5
1992	240.9
1993	265.12
1994	291.77
1995	320.38
1996	343.42
1997	366.76
1998	390.95
1999	416.94
2000	445.96
2001	474
2002	505.67
2003	542.33
2004	585.08
2005	635.13
2006	664.04
2007	697.66
2008	735.63
2009	775.51
2010	816.26
2011	876.72
2012	940.3
2013	1006.57
2014	1075
2015	1145.29
2016	1215.65