Year	Number of
1990	775.57
1991	780.02
1992	786.09
1993	789.91
1994	805.04
1995	821.71
1996	838.36
1997	855.18
1998	858.78
1999	872.77
2000	889.72
2001	912.05
2002	941.38
2003	964.41
2004	986.61
2005	1006.72
2006	1036.16
2007	1071.71
2008	1161.57
2009	1230.49
2010	1292.73
2011	1349.24
2012	1407.35
2013	1470.09
2014	1542.33
2015	1578.16
2016	1616.26