Year	Number of
1990	160.12
1991	169.73
1992	182.51
1993	196.82
1994	214.56
1995	229.12
1996	237.91
1997	246.33
1998	256.84
1999	268.53
2000	272.81
2001	278.41
2002	288.37
2003	289.84
2004	293.58
2005	297.49
2006	306.02
2007	315.16
2008	324.24
2009	337.89
2010	352.02
2011	359.13
2012	369.05
2013	375.64
2014	383.56
2015	392.05
2016	402.3