Year	Percent
1992	45.03866
1993	47.96003
1994	54.6364
1996	62.84176
1997	66.3827
1998	69.6412
1999	75.1726
2000	72.95667
2001	72.20971
2002	71.83258
2003	71.26796
2004	71.78093
2005	74.14955
2006	78.99827
2007	81.00214
2008	82.74488
2009	85.92801
2010	88.7592
2011	94.44216
2012	97.23433
2013	101.29782
2014	102.59738
2015	102.87099
2016	101.32847