Year	Number of
1990	334.7
1991	345.21
1992	359.37
1993	386.66
1994	399.31
1995	412.19
1996	393.89
1997	376.34
1998	365.39
1999	370.26
2000	376.98
2001	365.26
2002	381.13
2003	386.36
2004	395.03
2005	394.66
2006	399.62
2007	404.48
2008	402.53
2009	403.43
2010	396.14
2011	393.82
2012	390.91
2013	395.83
2014	402.79
2015	409.29
2016	417.79