Year	%
1997	12.8
2000	10.83
2001	10.6
2002	7.68
2003	7.57
2004	6.97
2005	6.51
2006	6.36
2007	5.21
2008	3.24
2009	5.29
2010	4.95
2011	1.76
2012	1.68
2013	1.87
2014	2.02
2015	1.95
2016	1.82
2017	1.26
2018	1.99
2019	1.99
2020	2.21
2021	2.28