Year	Number of
1990	413.22
1991	415.16
1992	421.27
1993	426.18
1994	430.68
1995	433.8
1996	451.19
1997	465.48
1998	486.19
1999	502.21
2000	522.01
2001	535.61
2002	545.47
2003	564.27
2004	578.62
2005	592.44
2006	612.71
2007	634.44
2008	658.67
2009	681.34
2010	712.79
2011	728.12
2012	743.6
2013	747.67
2014	745.41
2015	744.47
2016	737.29