Year	Number of
1990	164.22
1991	170.5
1992	176.83
1993	182.96
1994	187.5
1995	194.83
1996	203.8
1997	209.83
1998	209.2
1999	210.32
2000	216.58
2001	215.29
2002	222.92
2003	230.44
2004	234.84
2005	239.74
2006	244.19
2007	248.49
2008	254.43
2009	259.21
2010	271.67
2011	282.06
2012	281.32
2013	282.89
2014	287.21
2015	292.02
2016	297.2