Year	Number of
1990	282.68
1991	293.83
1992	310.6
1993	325.75
1994	342.49
1995	358.45
1996	372.52
1997	385.08
1998	404.98
1999	413.23
2000	430.04
2001	444.63
2002	460.5
2003	471.32
2004	489.69
2005	526.1
2006	545.27
2007	596.45
2008	633.6
2009	667.51
2010	702.01
2011	732.64
2012	756.4
2013	745.11
2014	748.39
2015	755.97
2016	758.47