Year	Percent
1991	4.47789
1992	4.47789
1993	4.47788
1994	4.47785
1995	4.47787
1996	4.47788
1997	4.47787
1998	2.55527
1999	2.55527
2000	2.55524
2001	2.55527
2002	2.55528
2003	2.55525
2004	2.55528
2005	2.55526
2006	2.55526
2007	2.55525
2008	2.88243
2009	2.89187
2010	2.89863
2011	2.99704
2012	3.00626
2013	2.98462
2014	2.95799
2015	2.92469
2016	2.88469
2017	2.8847