Year	Number of
1990	164.33
1991	167.65
1992	170.93
1993	173.99
1994	177.13
1995	180.51
1996	186.06
1997	191.84
1998	197.65
1999	203.89
2000	210.75
2001	218.01
2002	225.75
2003	234.09
2004	243.31
2005	253.58
2006	262.51
2007	272.06
2008	282.51
2009	294.01
2010	306.75
2011	318.36
2012	330.85
2013	343.53
2014	357.29
2015	372.31
2016	391.68