Year	Number of
1990	168.81
1991	183.26
1992	191.83
1993	201.43
1994	215.24
1995	226.81
1996	235.6
1997	253.98
1998	285.47
1999	321.16
2000	372.72
2001	416.32
2002	458.38
2003	500.42
2004	531.06
2005	558.48
2006	587.49
2007	609.98
2008	642.75
2009	668.93
2010	702.2
2011	722.95
2012	748.77
2013	772.14
2014	795.61
2015	822.27
2016	846.45