Year	%
1989	14.92023
1993	13.26004
1995	13.59058
1996	12.45095
1997	11.06351
1998	10.38867
1999	9.840958
2000	9.640119
2001	10.13896
2002	10.34778
2003	9.508335
2004	7.658468
2005	7.624135
2006	7.579972
2007	7.728516
2008	7.910805
2009	8.034308
2010	7.634188
2011	7.474881
2012	8.397274
2013	7.855266
2014	7.85752
2015	7.856117
2016	7.660544
2017	5.209977
2018	5.225183
2019	5.120376
2020	5.176554
2021	5.658379