Year	Number of
1990	251.22
1991	266.22
1992	281.35
1993	298.26
1994	317.61
1995	338.99
1996	361.51
1997	386
1998	418.07
1999	451.56
2000	479.98
2001	499.89
2002	527.36
2003	548.78
2004	569.04
2005	591.85
2006	612.74
2007	634.69
2008	657.99
2009	690.01
2010	721.24
2011	751.19
2012	781.02
2013	803.67
2014	826.7
2015	854.16
2016	878.3