Year	Number of
1990	116.23
1991	122.2
1992	128.03
1993	134.61
1994	141.25
1995	148.28
1996	153.91
1997	161.57
1998	166.59
1999	171.75
2000	178.49
2001	184.86
2002	192
2003	196.61
2004	203.48
2005	211.65
2006	219.27
2007	225.98
2008	232.25
2009	240.41
2010	247.59
2011	255.43
2012	263.09
2013	271.79
2014	281.19
2015	290.79
2016	300.42