Year	%
1997	15.2
2000	12.05
2001	11.6
2002	8.66
2003	8.44
2004	7.49
2005	7.36
2006	6.72
2007	5.99
2008	1.43
2009	4.72
2010	4.82
2011	0.89
2012	0.7
2013	0.74
2014	0.67
2015	0.66
2016	0.75
2017	0.63
2018	0.77
2019	0.77
2020	0.76
2021	0.78