Year	Number of
1990	139.16
1991	146.68
1992	154.04
1993	162.34
1994	170.82
1995	179.48
1996	187.47
1997	195.26
1998	205.39
1999	215.17
2000	224.4
2001	233.72
2002	242.57
2003	252.19
2004	262.1
2005	270.31
2006	278.16
2007	288.04
2008	298.1
2009	309.18
2010	320.23
2011	330.78
2012	345.05
2013	354.94
2014	367.32
2015	381.76
2016	403.26