Year	Number of
1990	143.66
1991	154.25
1992	164.9
1993	176.33
1994	188.69
1995	202.02
1996	214.7
1997	226.47
1998	242.59
1999	260.48
2000	277.49
2001	296.31
2002	317.6
2003	338.44
2004	359.79
2005	384.79
2006	406.99
2007	432.7
2008	460.23
2009	493.15
2010	526.4
2011	566.99
2012	606.24
2013	633.7
2014	670.47
2015	712.04
2016	754.2