Year	%
1996	100
1998	99.92574
1999	100
2000	99.92751
2001	100
2002	99.67722
2003	99.44983
2004	99.10259
2005	98.52053
2006	99.25158
2007	99.06796
2008	99.37895
2009	99.14976
2010	98.44428
2011	98.91393
2012	98.88116
2013	98.9093
2014	99.06665
2015	99.41228
2016	99.07919