Year	%
1988	9.91333
1989	0.3945076
1990	16.38955
1991	18.51226
1992	0.0359638
1993	0.278589
1994	0.3509952
1995	3.58261
1996	25.44245
1997	0.323108
1998	0.1137267
1999	0.8045355
2000	0.3344694
2001	0.2810685
2002	0.7901869
2003	0.3610843
2004	0.1445216
2005	0.1973973
2006	0.508318
2007	0.581847
2008	0.5280921
2009	0.5856467
2010	0.3111239
2011	0.8624172
2012	0.3146211
2013	0.3567618
2014	0.0400498
2015	0.4849351
2016	0.5323016
2017	0.0962686