Year	%
1991	4.045445
1993	1.814059
1996	3.371888
1997	3.784143
1998	3.55018
1999	3.572819
2000	3.648985
2001	0
2002	0.2919807
2003	0.2823931
2004	0.2847712
2005	0.3167505
2006	0.3706949
2007	0
2008	0.3039944
2009	0
2010	0.2456485
2011	0.2538942
2012	0.2486293
2013	0.2946893
2014	0
2015	0.27215
2016	0.246765
2017	0.2852405
2018	0.2906977
2019	0.2591018
2020	0.2128895
2021	0.2327922