Year	Number of
1990	403.16
1991	408.52
1992	419.44
1993	427.33
1994	443.62
1995	464.83
1996	482.66
1997	492
1998	505.56
1999	521.67
2000	541.86
2001	558.64
2002	575.43
2003	592.22
2004	613.99
2005	633.04
2006	652.98
2007	673.02
2008	697.15
2009	726.52
2010	752.05
2011	774.33
2012	796.92
2013	818.4
2014	836.97
2015	856.74
2016	875.9