Year	Number of
1990	178.87
1991	184.36
1992	190.75
1993	197.78
1994	204.96
1995	212.08
1996	218.08
1997	223.73
1998	229.28
1999	234.89
2000	240.94
2001	249.74
2002	259.44
2003	270.37
2004	281.54
2005	292.77
2006	302.97
2007	312.91
2008	323.35
2009	334.89
2010	348.05
2011	359.29
2012	372.02
2013	385.53
2014	399.87
2015	414.88
2016	430.04