Year	Number of
1990	268.06
1991	285.49
1992	296.87
1993	311.82
1994	336.2
1995	348.74
1996	362.28
1997	387.94
1998	421.35
1999	462.36
2000	511.48
2001	542.41
2002	579.42
2003	609.5
2004	637.81
2005	655.21
2006	676.07
2007	692.7
2008	710.11
2009	738.32
2010	766.71
2011	776.12
2012	789.49
2013	790.72
2014	797.22
2015	808.1
2016	818.67