Year	Number of
1990	200.32
1991	207.3
1992	214.13
1993	226.98
1994	236.99
1995	251.04
1996	261.85
1997	271.77
1998	282.43
1999	292.23
2000	300.95
2001	309.55
2002	312.67
2003	318.61
2004	321.08
2005	329.19
2006	337.28
2007	341.73
2008	348.29
2009	354.81
2010	365.38
2011	378.79
2012	393.76
2013	406.79
2014	418.62
2015	430.25
2016	443.63