Year	Number of
1990	179.41
1991	189.13
1992	199.72
1993	210.75
1994	222.44
1995	235.32
1996	248.98
1997	264
1998	280.28
1999	297.55
2000	316.27
2001	340.87
2002	368.03
2003	397.1
2004	428.87
2005	463.77
2006	497.03
2007	533.05
2008	572.41
2009	615.03
2010	660.89
2011	693.91
2012	729.5
2013	766.16
2014	804.29
2015	843.93
2016	885.73