Year	%
1988	5.712336
1993	7.868853
1995	19.87163
1996	7.084896
1997	20.20726
1998	10.68978
1999	6.427175
2000	9.306366
2001	6.657291
2002	5.974979
2003	4.731926
2004	4.82491
2005	4.824818
2006	4.58146
2007	4.807263
2008	4.682186
2009	4.609497
2010	6.053887
2011	6.136704
2012	6.119245
2013	6.257404
2014	5.43649
2015	6.462536
2016	6.618624
2017	6.409651
2018	6.262103
2019	4.986966
2020	5.316373
2021	5.593014