Year	%
1990	6.52
1993	6.79
1995	4.49
1996	4.24
1997	3.29
1998	3
1999	2.64
2000	2.6
2001	2.56
2002	2.55
2003	2.52
2004	2.5
2005	2.41
2006	2.36
2007	2.26
2008	2.4
2009	2.44
2010	2.14
2011	2.35
2012	2.3
2013	2.25
2014	2.32
2015	2.23
2016	2.28
2017	2.31
2018	2.31
2019	2.14
2020	2.83
2021	2.78