Year	Percent change
1987	0.541
1988	11.462
1989	7.643
1990	2.911
1991	6.909
1992	0.253
1993	-2.052
1994	6.897
1995	8.401
1996	-1.19
1997	12.97
1998	9.633
1999	5.709
2000	16.211
2001	10.324
2002	-1.363
2003	2.054
2004	6.982
2005	-1.897
2006	16.021
2007	0.518
2008	5.715
2009	-17.06
2010	13.363
2011	9.393
2012	-5.922
2013	5.586
2014	20.671
2015	-7.318
2016	2.528
2017	1.326
2018	-0.406
2019	3.036
2020	2.015
2021	2.34
2022	1.836
2023	1.508
2024	1.508