Year	Number of
1990	271.12
1991	277.23
1992	283.09
1993	292.68
1994	300.53
1995	309
1996	317.75
1997	327.53
1998	342.07
1999	358.11
2000	372.4
2001	396.71
2002	419.95
2003	441.01
2004	457.82
2005	472.16
2006	483.56
2007	495.5
2008	509.57
2009	525.66
2010	544.15
2011	563.72
2012	585.65
2013	612.35
2014	641.21
2015	672.91
2016	701.13