Year	Number of
1990	270.88
1991	291.04
1992	317.38
1993	348.17
1994	379.74
1995	410.69
1996	429.06
1997	444.53
1998	458.55
1999	474.09
2000	493.23
2001	506.48
2002	523.53
2003	542.66
2004	562.09
2005	581.6
2006	596.43
2007	609.18
2008	622.49
2009	637.12
2010	654.76
2011	671.27
2012	691.46
2013	713.83
2014	737.43
2015	761.55
2016	788.26