Year	Percent change
1999	8.432
2000	12.418
2001	12.468
2002	11.703
2003	12.986
2004	13.695
2005	13.567
2006	13.307
2007	12.5
2008	7.558
2009	4.385
2010	5.247
2011	5.471
2012	6.486
2013	7.899
2014	8.2
2015	7.473
2016	5.151
2017	6.334
2018	6.689
2019	6.448
2020	6.593
2021	6.732
2022	6.868
2023	6.934
2024	6.956