Year	Number of
1990	162.64
1991	170.36
1992	177.25
1993	184.7
1994	192.54
1995	200.73
1996	207.2
1997	212.61
1998	220.61
1999	227.74
2000	232.78
2001	239.77
2002	246.06
2003	251.36
2004	256.27
2005	260.03
2006	263.5
2007	267.3
2008	270.87
2009	277.12
2010	281.5
2011	288.99
2012	298.08
2013	300.77
2014	307.11
2015	316.12
2016	327.97