Year	%
1990	17.43
1992	17.27
1995	18.72
1998	18.54
2000	22.55
2002	28.54
2003	19.87
2004	18.47
2005	16.89
2006	16.07
2008	11.97
2009	16.23
2010	8.9
2011	14.43
2012	11.6
2013	8.04
2015	8.03
2016	9.07