Year	%
1988	5.18
1990	7.19
1991	7.26
1993	9.52
1996	7.59
1997	8.29
1999	8.24
2000	8.4
2001	8.01
2002	6.97
2003	7.38
2004	6.71
2005	6.96
2006	6.79
2007	6.73
2008	6.08
2009	5.41
2010	5.75
2011	5.67
2012	5.6
2013	4.5
2014	4.24
2015	4.38
2016	4.64
2017	4.38
2018	4.45
2019	14.63
2020	4.5
2021	4.89