Year	%
1989	17.72
1990	18.15
1993	14.51
1995	13.11
1996	9.36
1997	18
1998	6.88
1999	8.11
2000	6.71
2001	5.21
2002	4.69
2003	5.14
2004	5.27
2005	5.29
2006	4.65
2007	3.73
2008	5.44
2009	2.41
2010	2.96
2011	3.12
2012	3.08
2013	2.94
2016	2.78
2017	1.95
2018	1.9
2019	1.82
2020	1.8
2021	1.68