Year	Number of
1990	373.19
1991	367.13
1992	358.38
1993	353.28
1994	344
1995	335.91
1996	324.47
1997	316.46
1998	306.59
1999	299.35
2000	294.57
2001	292.07
2002	291.08
2003	281.63
2004	274
2005	271.35
2006	264.22
2007	259.94
2008	253.76
2009	250.19
2010	246.77
2011	246.27
2012	243.42
2013	240.1
2014	237.19
2015	239.57
2016	242.07