Year	Number of
1990	370.17
1991	383.75
1992	398.11
1993	413.37
1994	430.23
1995	448.92
1996	465.42
1997	483.13
1998	501.71
1999	522.29
2000	544.92
2001	559.75
2002	574.71
2003	588.83
2004	605.53
2005	624.16
2006	633.92
2007	643.19
2008	652.54
2009	662.67
2010	673.29
2011	699.65
2012	727.84
2013	757.18
2014	788.56
2015	823.22
2016	859.84