Year	Number of
1990	306.77
1991	325.41
1992	334.89
1993	344.45
1994	347.81
1995	350.67
1996	360.5
1997	369.2
1998	384.8
1999	400.41
2000	395.13
2001	398.6
2002	398.61
2003	401.8
2004	406.84
2005	409.05
2006	403.84
2007	405.26
2008	398.86
2009	399.73
2010	396.31
2011	392.93
2012	394.49
2013	390.94
2014	375.28
2015	389.19
2016	390.98