Year	Number of
1990	321.14
1991	333.35
1992	350.28
1993	365.03
1994	376.92
1995	378.27
1996	376.76
1997	380.05
1998	392.12
1999	387.83
2000	388.13
2001	389.36
2002	390.17
2003	389.67
2004	382.83
2005	390.01
2006	392.56
2007	393.53
2008	394.67
2009	395.14
2010	393.19
2011	395.52
2012	393.05
2013	396.64
2014	400.2
2015	414.54
2016	427.62