Year	Number of
1990	771.05
1991	786.41
1992	806.18
1993	820.4
1994	820.46
1995	835.98
1996	853.02
1997	865
1998	873.31
1999	888.65
2000	889.8
2001	891.73
2002	886.36
2003	894.74
2004	898.59
2005	901.17
2006	908.87
2007	909.2
2008	914.17
2009	926.82
2010	942.19
2011	947.48
2012	949.61
2013	937.53
2014	912.06
2015	902.73
2016	881.78