Year	%
1992	5.15
1997	4.9
2001	4.95
2002	7.66
2003	4.7
2004	4.85
2005	3.8
2006	3.88
2007	3.67
2008	3.85
2009	3.57
2012	3.52
2013	3.39
2014	3.33
2015	3.29
2016	3.18
2017	3.36
2018	3.36
2019	3.16
2020	3.15
2021	2.99