Year	Number of
1990	182.49
1991	188.01
1992	193.27
1993	203.57
1994	211.57
1995	220.36
1996	229.3
1997	240.6
1998	249.4
1999	261.7
2000	268.35
2001	278.58
2002	289.42
2003	297.02
2004	302.27
2005	314.55
2006	320.78
2007	320.73
2008	331.48
2009	350.48
2010	358.19
2011	368.33
2012	375.23
2013	391.08
2014	391.65
2015	392.24
2016	389.69