Year	Percent change
1988	9.616
1989	3.327
1990	1.118
1991	7.592
1992	7.069
1993	4.042
1994	8.181
1995	5.979
1996	5.898
1997	4.007
1998	4.682
1999	12.705
2000	9.575
2001	8.561
2002	6.579
2003	8.506
2004	10.341
2005	13.25
2006	10.771
2007	10.213
2008	6.692
2009	0.087
2010	5.963
2011	7.07
2012	7.313
2013	7.357
2014	7.143
2015	7.036
2016	6.863
2017	6.997
2018	7.251
2019	6.833
2020	6.733
2021	6.601
2022	6.417
2023	6.216
2024	6.039