Year	Number of
1990	642.69
1991	641.34
1992	641.72
1993	644.55
1994	647.8
1995	653.29
1996	654.95
1997	657.43
1998	661.02
1999	665
2000	672.17
2001	676.55
2002	684.99
2003	693.61
2004	706.42
2005	721.29
2006	731
2007	742.2
2008	754.63
2009	769.15
2010	785.42
2011	797.25
2012	809.83
2013	820.53
2014	832.94
2015	847.07
2016	861.55