Year	%
1988	16.31
1991	18.77
1993	14.22
1996	13.17
1997	11.32
1998	13.09
1999	11.51
2000	10.25
2001	7.33
2002	3.45
2003	7.4
2004	23.01
2005	2.43
2006	4.63
2007	6.97
2008	6.71
2009	7.36
2010	7.08
2011	5.31
2012	5.37
2013	6.04
2014	2.24
2016	4.66
2020	4.29
2021	4.33