Year	Number of
1990	598.3
1991	634.79
1992	683.24
1993	730.12
1994	771.78
1995	813.14
1996	826.66
1997	859.1
1998	895.98
1999	951.11
2000	1003.49
2001	1039.79
2002	1079.07
2003	1125.38
2004	1154.55
2005	1201.38
2006	1268.74
2007	1322.18
2008	1371.17
2009	1426.75
2010	1478.82
2011	1501.2
2012	1527.33
2013	1534.37
2014	1521.64
2015	1540.37
2016	1567.76