Year	Number of
1990	397.36
1991	382.82
1992	370.59
1993	358.87
1994	347.87
1995	342.9
1996	331.54
1997	321.32
1998	307.54
1999	299.77
2000	290.03
2001	283.64
2002	281.01
2003	275.49
2004	265.32
2005	261.24
2006	260.84
2007	257.17
2008	249.56
2009	247.7
2010	247.4
2011	245.54
2012	248.15
2013	246.23
2014	240.71
2015	242.63
2016	246.23