Year	Number of
1990	909.87
1991	882.49
1992	848.58
1993	818.49
1994	787.72
1995	759.84
1996	727.98
1997	693.18
1998	654.22
1999	625.16
2000	596.24
2001	574.29
2002	561.59
2003	554.73
2004	543.13
2005	531.57
2006	517.5
2007	498.89
2008	489.92
2009	481.79
2010	461.9
2011	469.33
2012	471.73
2013	465.89
2014	460.87
2015	466.78
2016	472.93