Year	%
1987	64.01398
1988	77.03769
1989	81.54165
1990	61.14216
1994	62.25952
1995	67.38613
1998	67.90215
1999	60.05984
2000	69.88777
2001	69.43051
2002	77.03492
2003	57.37042
2004	57.43261
2005	62.54417
2009	82.35227
2010	87.77683
2011	79.75524
2012	86.84435
2015	65.19256