Year	Number of
1990	611.98
1991	635.57
1992	661.18
1993	688.96
1994	719.37
1995	754.54
1996	784.2
1997	832.73
1998	849.13
1999	885.7
2000	944.98
2001	955.21
2002	1020.07
2003	1064.88
2004	1109.53
2005	1144.76
2006	1185.53
2007	1225.59
2008	1302.25
2009	1312.48
2010	1368.96
2011	1377.52
2012	1399.03
2013	1422.86
2014	1455.66
2015	1494.29
2016	1539.24