Year	Number of
1990	312.21
1991	329.57
1992	299.7
1993	308.32
1994	333.95
1995	331.14
1996	299.96
1997	251.21
1998	233.01
1999	232.87
2000	236.76
2001	227.93
2002	230.74
2003	233.1
2004	228.62
2005	244.7
2006	239.41
2007	235.77
2008	227.5
2009	220.15
2010	223.71
2011	196.7
2012	198.55
2013	188.14
2014	196.79
2015	196.84
2016	194.42