Year	Number of
1990	126.27
1991	130.36
1992	133.7
1993	140.32
1994	145.7
1995	151.81
1996	157.69
1997	165.81
1998	174.32
1999	181.43
2000	191.38
2001	202.76
2002	215.69
2003	229.87
2004	244.42
2005	258.97
2006	268.28
2007	277.88
2008	288.61
2009	301.51
2010	316.8
2011	330.13
2012	344.19
2013	358.22
2014	372.25
2015	386.89
2016	405.38