Year	% of total
1985	97.11889567703037
1986	97.49615123864459
1987	97.66756507853358
1988	97.7997028668512
1989	97.47992971706715
1990	97.17144605808033
1991	97.79786587747012
1992	97.34990494845898
1993	96.81020805134503
1994	96.25402969647521
1995	95.71534596516229
1996	94.90562230594904
1997	94.98001559889782
1998	95.00062695756901
1999	95.63205482992649
2000	93.92703293181806
2001	93.11310303986549
2002	92.99211139726543
2003	92.78071901765668
2004	92.9924886972833
2005	93.91377500179435
2006	94.50670300363927
2007	94.49723448647326
2008	94.52912193055741
2009	94.8069340078863
2010	94.84840752311023
2011	95.25304607415367
2012	90.171634027601
2013	92.69368408223224
2014	93.1993828259583