Year	Number of
1990	529.43
1991	521.69
1992	519.25
1993	516.06
1994	515.41
1995	518.01
1996	517.33
1997	518.21
1998	529.48
1999	546.13
2000	566.57
2001	553.58
2002	563.26
2003	581.65
2004	580.51
2005	596.36
2006	599.57
2007	608.04
2008	618.23
2009	635.48
2010	659.41
2011	685.99
2012	710.79
2013	733.92
2014	755.42
2015	773.77
2016	794.25