Year	Number of
1990	75.44
1991	79.75
1992	86.02
1993	90.88
1994	97
1995	101.64
1996	107.7
1997	113.84
1998	117.21
1999	119.9
2000	124.3
2001	128.63
2002	133.25
2003	137.9
2004	142.87
2005	148.15
2006	153.71
2007	158.62
2008	162.51
2009	168.01
2010	174.07
2011	178.12
2012	185.21
2013	193.54
2014	197.1
2015	200.81
2016	205.08