Year	Number of
1990	705.07
1991	729.67
1992	757.73
1993	785.48
1994	816.01
1995	845.57
1996	879.67
1997	910.44
1998	940.73
1999	994.02
2000	1055.16
2001	1093.45
2002	1136.2
2003	1182.53
2004	1232.22
2005	1281.88
2006	1326.79
2007	1371.58
2008	1417.76
2009	1472.01
2010	1528.87
2011	1542.46
2012	1551.12
2013	1556.8
2014	1557.32
2015	1553.04
2016	1534.98