Year	Number of
1990	193.29
1991	196.47
1992	202.92
1993	210.1
1994	218.88
1995	229.6
1996	242.45
1997	255.6
1998	265.23
1999	270.59
2000	283.37
2001	293.03
2002	296.07
2003	304.24
2004	310.03
2005	314.79
2006	318.4
2007	329.54
2008	340.58
2009	350.76
2010	357.58
2011	362.28
2012	370.52
2013	378.67
2014	386.52
2015	394.5
2016	402.71