Year	Number of
1990	373.87
1991	391.88
1992	405.05
1993	424.34
1994	456.47
1995	464.41
1996	460.42
1997	451.02
1998	453.49
1999	463.73
2000	456.86
2001	452
2002	439.77
2003	425.94
2004	419.95
2005	385.91
2006	394.65
2007	393.07
2008	393.34
2009	386.96
2010	384.24
2011	388.3
2012	392.35
2013	399.87
2014	414.13
2015	409.58
2016	404.46