Year	Number of
1990	174.32
1991	177.64
1992	182.28
1993	187.59
1994	193.59
1995	204.03
1996	214.96
1997	225
1998	229.16
1999	230.42
2000	229.06
2001	229.83
2002	233.4
2003	239.08
2004	245.95
2005	251.66
2006	256.12
2007	257.99
2008	261.5
2009	270.72
2010	279.7
2011	283.11
2012	285.1
2013	286.36
2014	286.26
2015	292.14
2016	298.43