Year	%
1988	13.39
1990	10.5
1991	11.32
1993	13.45
1996	8.27
1997	5.99
1999	5.47
2000	5.27
2001	5.1
2002	4.95
2003	5.15
2004	5.29
2005	5.64
2006	5.29
2007	4.81
2008	3.9
2009	4.32
2010	4.59
2011	4.39
2012	4.22
2013	4.15
2014	3.87
2015	4.38
2016	4.51
2017	4.61
2018	4.32
2019	5.37
2020	4.4
2021	4.46