Year	Number of
1990	547.89
1991	550.13
1992	565.83
1993	574.02
1994	603.37
1995	656.36
1996	649.55
1997	652.47
1998	642.5
1999	633.79
2000	639.59
2001	631.92
2002	626.18
2003	611.59
2004	606.47
2005	599.65
2006	600.88
2007	597.85
2008	593.93
2009	592.59
2010	602.94
2011	607.68
2012	612.91
2013	622.67
2014	634.44
2015	647.81
2016	663.45