Year	Number of
1990	76.96
1991	78.41
1992	79.06
1993	81.17
1994	86.73
1995	90.02
1996	96.36
1997	99.48
1998	103.68
1999	109.63
2000	113.81
2001	119.98
2002	119.6
2003	125.23
2004	129.05
2005	126.63
2006	129.58
2007	126.49
2008	129.48
2009	129.35
2010	125.48
2011	127.87
2012	127.6
2013	126.08
2014	127.52
2015	129.53
2016	131.08