Year	Number of
1990	300.84
1991	310.9
1992	322.37
1993	334.23
1994	342.16
1995	346.76
1996	349.01
1997	355.67
1998	354.83
1999	362.15
2000	365.42
2001	369.08
2002	380.96
2003	387.03
2004	392.82
2005	399.36
2006	403.04
2007	406.73
2008	410.09
2009	413.5
2010	417.86
2011	420.82
2012	425.86
2013	430.58
2014	437.05
2015	445.18
2016	453.68