Year	Number of
1990	165.52
1991	170.78
1992	176.66
1993	183.38
1994	189.88
1995	196.73
1996	200.43
1997	204.52
1998	208.63
1999	213.45
2000	218.24
2001	225.09
2002	233.79
2003	242.39
2004	252.7
2005	263.04
2006	270.78
2007	280.08
2008	290.37
2009	301.76
2010	313.21
2011	325.96
2012	340.16
2013	355.06
2014	371.26
2015	387.66
2016	402.85