Year	Number of
1990	398.37
1991	407.03
1992	419.12
1993	435.59
1994	437.78
1995	442.78
1996	450.33
1997	460.97
1998	468.77
1999	481.47
2000	505.47
2001	519.61
2002	533.93
2003	551.1
2004	571.22
2005	595.02
2006	613.11
2007	635.8
2008	651.49
2009	663.87
2010	679.22
2011	701.35
2012	718.46
2013	735.96
2014	751.85
2015	767.76
2016	788.86