Year	Number of
1990	315.56
1991	324.46
1992	326.58
1993	332.48
1994	333.13
1995	332.37
1996	329.16
1997	308.41
1998	305.55
1999	309.67
2000	310.3
2001	315.8
2002	320.69
2003	326.5
2004	333.22
2005	344.36
2006	350.58
2007	359.18
2008	363.93
2009	368.7
2010	377.52
2011	383.81
2012	384.06
2013	391.21
2014	398.37
2015	413.86
2016	427