Year	Number of
1990	248.3
1991	255.67
1992	275.05
1993	303.78
1994	326.51
1995	327.72
1996	318.3
1997	316.86
1998	323.16
1999	329.09
2000	345.07
2001	346.93
2002	348.19
2003	343.48
2004	344.71
2005	330.53
2006	321.94
2007	309.95
2008	295.63
2009	290.71
2010	288.65
2011	288.78
2012	290.11
2013	298.01
2014	303.93
2015	307.5
2016	312.07