Year	%
1991	8.032128
1992	20.82973
1994	24.47803
1995	26.08333
1996	28.83699
1997	28.53427
1998	31.56095
1999	30.66911
2000	30.41592
2001	29.60623
2002	30.64899
2003	30.73952
2004	26.19735
2005	27.04128
2006	22.97228
2007	35.57013
2008	36.18102
2009	35.97963
2010	24.53062
2011	23.72953
2012	3.731268
2013	26.22934
2014	25.40811
2015	5.237727
2016	3.344934
2017	16.14715
2018	2.809233
2019	2.87014
2020	2.505915
2021	2.692791