Year	%
1988	4.28
1990	4.8
1991	5.12
1993	7.31
1996	5.67
1997	2.95
1999	3
2000	2.78
2001	2.56
2002	2.69
2003	2.68
2004	2.13
2005	2.46
2006	2.39
2007	2.43
2008	2
2009	2.32
2010	2.65
2011	2.54
2012	2.52
2013	2.74
2014	2.21
2015	3.19
2016	4.39
2017	4.29
2018	3.35
2019	14.41
2020	5.02
2021	5.46