Year	Number of
1990	120.45
1991	124.23
1992	128.1
1993	132.22
1994	136.56
1995	141.26
1996	148.28
1997	155.85
1998	164.18
1999	173.27
2000	183.28
2001	192.72
2002	202.99
2003	214.13
2004	226.09
2005	238.98
2006	248.79
2007	258.91
2008	269.72
2009	281.38
2010	294.13
2011	304.84
2012	316.32
2013	328.19
2014	340.88
2015	354.46
2016	370.52