Year	%
1989	10.64
1993	9.83
1995	9.51
1996	7.99
1997	6.86
1998	5.11
1999	4.8
2000	4.67
2001	5.11
2002	4.75
2003	4.33
2004	4.12
2005	4.12
2006	3.99
2007	3.98
2008	3.99
2009	3.93
2010	3.18
2011	3.1
2012	2.98
2013	2.81
2014	2.77
2015	2.86
2016	2.65
2017	1.64
2018	1.65
2019	1.49
2020	1.47
2021	1.65