Year	Number of
1990	641.96
1991	669.9
1992	700.28
1993	733.8
1994	771.07
1995	807.88
1996	847.86
1997	887.85
1998	931.03
1999	956.7
2000	986
2001	1015.54
2002	1048.84
2003	1084.35
2004	1120.26
2005	1157.25
2006	1193.48
2007	1234.47
2008	1279.12
2009	1327.57
2010	1378.23
2011	1426.69
2012	1477.6
2013	1530.85
2014	1587.48
2015	1645.22
2016	1696.83