Year	Number of
1990	608.2
1991	633.1
1992	656.02
1993	666.79
1994	691.68
1995	723.96
1996	758.88
1997	758.52
1998	779.84
1999	800.94
2000	820.57
2001	832.05
2002	827.45
2003	861.47
2004	857.76
2005	865.68
2006	895.39
2007	929.11
2008	986.33
2009	1030.28
2010	1077.03
2011	1144.14
2012	1216.34
2013	1281.07
2014	1354.75
2015	1436.73
2016	1518.48