Year	Number of
1990	441.9
1991	440.12
1992	439.85
1993	460.01
1994	486.38
1995	520.88
1996	543.72
1997	563.14
1998	574.87
1999	604.58
2000	629.44
2001	664.69
2002	697.05
2003	738.08
2004	779.44
2005	809
2006	837.16
2007	870.21
2008	905.96
2009	958.9
2010	1023.25
2011	1060.1
2012	1102.38
2013	1152.72
2014	1186.73
2015	1205.5
2016	1244.56