Year	Number of
1990	751.76
1991	772.78
1992	796.46
1993	820.09
1994	845.21
1995	871.77
1996	937.49
1997	1007.22
1998	1082.49
1999	1163.68
2000	1252.15
2001	1280.55
2002	1311.46
2003	1349.5
2004	1387.13
2005	1423.58
2006	1471.7
2007	1518.72
2008	1566.25
2009	1617.93
2010	1676.31
2011	1688.19
2012	1705.41
2013	1724.54
2014	1747.24
2015	1772.97
2016	1798.17