Year	%
1988	17.21
1991	17.71
1993	13.37
1996	16.28
1997	13.51
1998	14.23
1999	16.44
2000	13.11
2001	7.46
2002	4.27
2003	8.17
2004	25.62
2005	3.49
2006	7.04
2007	10.23
2008	9.82
2009	9.92
2010	9.84
2011	8.34
2012	8.16
2013	10.93
2014	1.8
2016	8.08
2020	5.44
2021	5.62