Year	%
1972	39.43516
1985	60.6377
1986	65.82903
1997	65.46067
1998	65.3677
1999	63.74665
2000	67.19871
2001	76.05728
2002	77.3705
2003	72.87447
2004	70.59017
2005	83.35778
2006	75.58115
2007	81.70544
2008	86.6452
2009	87.76142
2010	86.94312
2011	85.89064
2012	85.87698
2013	86.06502
2014	88.10427
2015	88.47667