Year	Number of
1990	247.21
1991	256.41
1992	266.41
1993	277.29
1994	288.82
1995	301.03
1996	314.3
1997	328.21
1998	343.06
1999	358.82
2000	375.71
2001	389.17
2002	403.82
2003	419.93
2004	436.81
2005	454.47
2006	481.25
2007	509.23
2008	539.46
2009	571.61
2010	606.07
2011	643.03
2012	682.73
2013	725.58
2014	770.96
2015	818.88
2016	868.51