Year	Number of
1990	183.29
1991	189.86
1992	196.67
1993	203.96
1994	211.68
1995	220.52
1996	222.49
1997	216
1998	214.72
1999	216.3
2000	220.26
2001	226.1
2002	232.79
2003	242.72
2004	254.09
2005	265.35
2006	278.51
2007	290.8
2008	303.22
2009	317.68
2010	328.44
2011	338.13
2012	349.36
2013	360.65
2014	372.42
2015	385.29
2016	397.7