Year	Number of
1990	380.16
1991	396.57
1992	414.81
1993	433.35
1994	453.87
1995	476.82
1996	514.88
1997	556.94
1998	603.32
1999	653.71
2000	708.45
2001	722.27
2002	737.46
2003	758.38
2004	779.86
2005	801.58
2006	823.88
2007	845.54
2008	866.79
2009	889.87
2010	916.08
2011	921.76
2012	930.56
2013	940.19
2014	950.46
2015	960.88
2016	970.86