Year	Number of
1990	586.6
1991	598.85
1992	606.29
1993	626.38
1994	649.65
1995	656.72
1996	660.81
1997	666.14
1998	675.64
1999	698.52
2000	710.09
2001	724.06
2002	732.3
2003	751.45
2004	770.12
2005	790.97
2006	814.46
2007	834.11
2008	858.31
2009	884.72
2010	914.89
2011	947.98
2012	980.82
2013	1008.96
2014	1038.26
2015	1070.6
2016	1101.04