Year	%
1991	19.87
1993	11.01
1996	6.91
1997	6.93
1998	6.6
1999	6.21
2000	5.95
2001	4.91
2002	3.99
2003	4.05
2004	4
2005	3.3
2006	4.09
2007	4.26
2008	3.88
2009	3.96
2010	3.61
2011	2.47
2012	2.58
2013	2.63
2014	2.69
2015	2.72
2016	2.71
2017	2.9
2018	2.86
2019	2.72
2020	2.73
2021	2.86