Year	Percent change
1997	22.853
1998	13.814
1999	10.75
2000	4.442
2001	2.362
2002	5.053
2003	3.858
2004	6.257
2005	4.236
2006	5.691
2007	5.979
2008	5.594
2009	-0.816
2010	0.767
2011	0.908
2012	-0.707
2013	2.351
2014	1.15
2015	3.074
2016	3.215
2017	2.969
2018	3.1
2019	3.1
2020	3.2
2021	3.3
2022	3.4
2023	3.5
2024	3.5