Year	Number of
1990	876.1
1991	852.69
1992	832.23
1993	797.8
1994	784.93
1995	781.73
1996	773.11
1997	768.27
1998	731.17
1999	713.05
2000	700.82
2001	672.74
2002	666.58
2003	640.64
2004	634.81
2005	639.12
2006	636.15
2007	617.38
2008	600.39
2009	573.49
2010	559.42
2011	537.76
2012	521.96
2013	518.54
2014	519.15
2015	522.47
2016	524.45