Year	Number of
1990	121.04
1991	125.41
1992	129.57
1993	134.45
1994	140.66
1995	147.11
1996	153.71
1997	159.14
1998	166.13
1999	174.76
2000	185.12
2001	195.42
2002	206.1
2003	217.05
2004	228.13
2005	239.9
2006	251.71
2007	263.66
2008	277.25
2009	291.81
2010	306.97
2011	323.36
2012	338.68
2013	353.28
2014	369
2015	385.12
2016	405.28