Year	%
1988	13.11
1991	11.78
1993	9.8
1996	6.51
1997	7.19
1998	6.99
1999	7.29
2000	6.28
2001	7.33
2002	2.12
2003	5.56
2004	7.55
2005	2.24
2006	3.82
2007	5.08
2008	4.99
2009	5.04
2010	3.63
2011	3.85
2012	4.04
2013	4.62
2014	0.79
2016	3.52
2020	3.04
2021	3.15