Year	Number of
1990	264.31
1991	280.02
1992	295.51
1993	306.16
1994	318.96
1995	331.83
1996	338.82
1997	340.84
1998	336.93
1999	340.99
2000	345.22
2001	352.24
2002	363.25
2003	376.67
2004	394.08
2005	408.29
2006	413
2007	417.76
2008	415.09
2009	413.45
2010	421.41
2011	434.43
2012	445.36
2013	442.23
2014	432.17
2015	428.63
2016	442.66