Year	Number of
1990	142.85
1991	153.24
1992	164.21
1993	181.52
1994	205.27
1995	231.89
1996	248.92
1997	272.09
1998	307.42
1999	345.32
2000	376.87
2001	399.72
2002	428.69
2003	465.72
2004	501.15
2005	532.96
2006	553.99
2007	581.93
2008	601.47
2009	625.18
2010	650.04
2011	676.56
2012	695.82
2013	726.97
2014	761.75
2015	791.27
2016	823.36