Year	Number of
1990	335.77
1991	350.85
1992	367.08
1993	384.16
1994	402.12
1995	421.1
1996	437.27
1997	453.84
1998	470.13
1999	486.45
2000	503.16
2001	513.66
2002	523.7
2003	533.3
2004	543.04
2005	553.72
2006	563.81
2007	574
2008	585.96
2009	598.55
2010	612.15
2011	624.91
2012	638.43
2013	652.14
2014	666.42
2015	681.32
2016	698.65