Year	Number of
1990	660.85
1991	658.31
1992	657.03
1993	648.72
1994	619.7
1995	620.41
1996	620.37
1997	625.61
1998	636.69
1999	641.52
2000	630.09
2001	613.2
2002	618.9
2003	618.65
2004	620.43
2005	619.19
2006	621.18
2007	630.44
2008	634.56
2009	653.39
2010	668.84
2011	670.18
2012	669.93
2013	651.57
2014	647.36
2015	640.11
2016	635.38