Year	Number of
1990	328.62
1991	337.67
1992	347.01
1993	357.07
1994	367.82
1995	379.56
1996	391.52
1997	404.22
1998	417.89
1999	432.72
2000	448.62
2001	461.01
2002	474.48
2003	488.69
2004	503.96
2005	520.48
2006	535.54
2007	551.55
2008	569
2009	587.28
2010	604.96
2011	623.93
2012	645.27
2013	667.77
2014	691.37
2015	714.6
2016	738.66