Year	%
1989	9.66
1993	8.92
1995	9.28
1996	7.82
1997	6.74
1998	5.16
1999	5.05
2000	4.72
2001	5.17
2002	4.82
2003	6.38
2004	4.28
2005	4.29
2006	4.16
2007	4.14
2008	4.14
2009	4.08
2010	3.43
2011	3.37
2012	3.23
2013	3.07
2014	3.06
2015	3.14
2016	2.95
2017	1.99
2018	1.99
2019	2.1
2020	1.87
2021	2.06