Year	Number of
1990	307.64
1991	314.18
1992	317.75
1993	318.07
1994	319.78
1995	324.85
1996	342.37
1997	364.34
1998	391.65
1999	422.22
2000	455.23
2001	492.9
2002	535.2
2003	585.55
2004	638.54
2005	693.56
2006	723.82
2007	751.68
2008	780.84
2009	811.61
2010	845.42
2011	863.19
2012	883.93
2013	905.72
2014	928.56
2015	952.02
2016	977.75