Year	%
1980	65.20367
1983	69.63304
1984	56.56446
1986	62.17641
1987	66.44971
1999	77.2634
2000	71.13048
2001	73.63531
2002	73.17729
2003	80.40744
2004	70.15679
2005	70.83998
2007	81.65858
2008	83.18688
2009	85.44838
2010	91.79131
2014	78.1587
2015	68.06439
2016	79.57796