Year	Number of
1990	384.03
1991	387.77
1992	391.44
1993	395.19
1994	399.86
1995	405.63
1996	398.88
1997	392.56
1998	387.04
1999	381.38
2000	376.57
2001	370.8
2002	364.59
2003	358.44
2004	353.14
2005	348.2
2006	339.91
2007	331.6
2008	323.82
2009	316.44
2010	309.61
2011	307.14
2012	304.74
2013	302.04
2014	299.77
2015	298.07
2016	296.75