Year	Number of
1990	940.84
1991	951.76
1992	959.31
1993	951.25
1994	956.12
1995	940
1996	927.48
1997	902.89
1998	885.42
1999	882.8
2000	877.55
2001	873.91
2002	870.37
2003	871.37
2004	878.11
2005	857.16
2006	863
2007	872.39
2008	882.01
2009	875.68
2010	863.49
2011	867.77
2012	874.07
2013	877.87
2014	898.57
2015	931.64
2016	959.37