Year	Number of
1990	278.71
1991	283.2
1992	287.98
1993	293.66
1994	299.87
1995	306.79
1996	314.06
1997	321.78
1998	330.06
1999	336.94
2000	344.12
2001	358.5
2002	372.76
2003	387.2
2004	399.61
2005	411.88
2006	422.58
2007	433.7
2008	446.21
2009	460.27
2010	476.67
2011	489.33
2012	504.71
2013	523.58
2014	544.36
2015	567.27
2016	586.81