Year	%
1992	7.43
1997	4.49
2001	12.73
2002	13.65
2003	5.07
2004	4.68
2005	4.76
2006	4.9
2007	4.66
2008	4.56
2009	4.54
2012	4.32
2013	4.53
2014	4.53
2015	4.41
2016	4.35
2017	4.43
2018	4.43
2019	4.42
2020	4.42
2021	4.3