Year	Number of
1990	116.77
1991	119.94
1992	124.98
1993	128.02
1994	131.62
1995	138.35
1996	143.64
1997	149.08
1998	154.69
1999	160.68
2000	166.48
2001	172.44
2002	178.77
2003	185.99
2004	193.1
2005	199.72
2006	206.28
2007	212.66
2008	219.57
2009	226.89
2010	234.4
2011	242.02
2012	249.96
2013	258.19
2014	267.05
2015	276.42
2016	285.13