Year	Percent
1997	97.85183
1998	103.31633
1999	120.1399
2000	115.41067
2001	111.83269
2002	103.32699
2003	98.16402
2004	90.89536
2005	82.92237
2006	80.47706
2007	82.58789
2008	85.7573
2009	85.36918
2010	87.85736
2011	84.75204
2012	81.19094
2013	78.23687
2014	70.64785
2015	72.03409
2016	71.87933