Year	Number of
1990	771.84
1991	762.55
1992	761.56
1993	767.17
1994	755.25
1995	750.24
1996	735.9
1997	726.09
1998	714.97
1999	712.72
2000	688.09
2001	692.5
2002	686.55
2003	674.75
2004	672.26
2005	664.6
2006	660.14
2007	667.48
2008	666.63
2009	664.03
2010	656.41
2011	655.54
2012	644.67
2013	636.01
2014	619.24
2015	617.25
2016	616.33