Year	%
1997	6.5
1998	6
1999	6
2000	6.9
2001	6.7
2002	7
2003	7.6
2004	7.4
2005	7
2006	7.1
2007	7.4
2008	7.3
2009	7.6
2010	8.1
2011	8.5
2012	9
2013	9.1
2014	9.7
2015	9.7
2016	10
2017	10
2018	10.2
2019	10
2021	10.1