Year	Number of
1990	120.72
1991	123.75
1992	127.05
1993	130.56
1994	134.21
1995	138.06
1996	140.85
1997	143.89
1998	147.14
1999	150.54
2000	154.19
2001	155.54
2002	156.96
2003	158.58
2004	160.4
2005	162.58
2006	164.65
2007	166.78
2008	169.27
2009	172.1
2010	175.38
2011	178.46
2012	182.12
2013	185.99
2014	190.17
2015	194.65
2016	199.68