Year	Number of
1990	119.72
1991	121.38
1992	123.38
1993	125.54
1994	127.94
1995	130.23
1996	132.69
1997	135.14
1998	139.44
1999	143.99
2000	148.19
2001	148.8
2002	153.07
2003	156.43
2004	161.7
2005	162.48
2006	167.14
2007	171.44
2008	174.82
2009	179.97
2010	182.41
2011	184.1
2012	189.02
2013	192.87
2014	197.3
2015	201.98
2016	206.7