Year	Number of
1990	92.27
1991	95.75
1992	99.17
1993	101.72
1994	106.19
1995	114.03
1996	116.07
1997	120.14
1998	122.84
1999	119.72
2000	114.86
2001	103.03
2002	94.27
2003	85.62
2004	79.61
2005	76.19
2006	78.28
2007	81.5
2008	84.59
2009	87.46
2010	90.64
2011	93.56
2012	96.97
2013	101.41
2014	106.49
2015	112.66
2016	119.53