Year	Number of
1990	369.66
1991	377.68
1992	380.86
1993	380.19
1994	379.9
1995	378.15
1996	368.31
1997	359.78
1998	356.48
1999	349.5
2000	348.4
2001	349.81
2002	357
2003	367.66
2004	373.91
2005	380.67
2006	384.09
2007	386.05
2008	385.61
2009	383.86
2010	385.24
2011	388.26
2012	391.66
2013	397.64
2014	408.17
2015	408.02
2016	407.21