Year	Number of
1990	380.69
1991	383.67
1992	380.86
1993	388.08
1994	379.64
1995	374.09
1996	377.28
1997	376.86
1998	385.49
1999	385.69
2000	389.53
2001	384.08
2002	395.53
2003	392.2
2004	382.9
2005	375.12
2006	367.48
2007	359.31
2008	360.1
2009	354.52
2010	353.96
2011	354.18
2012	353.07
2013	347.37
2014	341.13
2015	340.74
2016	344.04