Year	Number of
1990	377.21
1991	386.5
1992	394.79
1993	400.07
1994	406.37
1995	417.84
1996	430.28
1997	420.72
1998	426.83
1999	433.44
2000	439.12
2001	454.27
2002	463.23
2003	478.89
2004	489.73
2005	502.09
2006	522.33
2007	543.48
2008	568.52
2009	592.45
2010	618.24
2011	655.24
2012	699.32
2013	744.35
2014	794.67
2015	851.11
2016	906.98