Year	Number of
1990	390.68
1991	380.61
1992	368.45
1993	343.56
1994	315.34
1995	287.54
1996	264.56
1997	259.01
1998	260.21
1999	261.46
2000	264.25
2001	264.27
2002	274.9
2003	294.34
2004	306.65
2005	283.15
2006	260.67
2007	248.46
2008	253.71
2009	259.16
2010	264.5
2011	266.24
2012	272.13
2013	264.83
2014	264.09
2015	254.6
2016	247.24