Year	%
1988	5.56
1993	5.69
1995	5.43
1996	4.61
1997	2.88
1998	2.46
1999	2.12
2000	1.79
2001	1.7
2002	1.42
2003	0.76
2004	0.69
2005	0.59
2006	0.55
2007	0.49
2008	0.47
2009	0.5
2010	0.66
2011	0.66
2012	0.63
2013	0.65
2014	0.66
2015	0.66
2016	0.7
2017	0.7
2018	0.7
2019	0.65
2020	0.69
2021	0.68