Year	%
1989	10.87731
1990	10.96623
1991	11.40789
1992	11.41503
1993	11.50841
1995	9.609604
1996	9.187134
1997	8.960987
1998	8.688624
1999	7.934903
2000	7.795129
2001	7.72047
2002	7.731103
2003	6.973958
2004	5.2148
2005	5.03807
2006	4.836478
2007	5.418488
2008	4.775193
2009	4.460267
2010	4.432086
2011	4.451167
2012	4.341097
2013	4.288975
2014	4.38129
2015	4.354247
2016	4.221258
2017	4.948077
2018	4.592044
2019	4.753657
2020	4.648269
2021	4.8504