Year	Number of
1990	277.87
1991	265.04
1992	254.38
1993	248.43
1994	242.6
1995	247.34
1996	244.55
1997	241.74
1998	256.55
1999	270.5
2000	282.5
2001	298.67
2002	321.05
2003	332.95
2004	357
2005	347.15
2006	343.29
2007	335.01
2008	343.39
2009	354.23
2010	349.87
2011	340.88
2012	333.61
2013	327.61
2014	338.07
2015	336.82
2016	337.87