Year	%
1991	68.05
1993	8.52
1996	8.43
1997	7.96
1998	8.03
1999	7.51
2000	6.53
2001	0.97
2002	0.78
2003	0.79
2004	0.74
2005	0.65
2006	0.42
2007	0.5
2008	0.54
2009	0.57
2010	0.44
2011	0.32
2012	0.3
2013	0.32
2014	0.38
2015	0.52
2016	0.44
2017	0.62
2018	0.58
2019	0.6
2020	0.69
2021	0.72