Year	Number of
1990	989.72
1991	954.07
1992	919.35
1993	892.95
1994	856.96
1995	820.63
1996	788.68
1997	752.73
1998	720.35
1999	684.91
2000	657.13
2001	643.35
2002	637.11
2003	643.98
2004	637.34
2005	640.7
2006	636.17
2007	634.22
2008	632.15
2009	637.54
2010	623.05
2011	643.28
2012	647.99
2013	647.15
2014	643.13
2015	650.84
2016	660.18