Year	%
1992	5.53
1997	4.68
2001	5.35
2002	7.97
2003	6.64
2004	4.83
2005	3.94
2006	3.97
2007	3.83
2008	4.25
2009	3.9
2012	3.41
2013	3.26
2014	3.2
2015	3.53
2016	3.56
2017	3.66
2018	3.67
2019	3.27
2020	3.24
2021	3.12