Year	Percent change
1987	-34.571
1988	266.652
1989	34.668
1990	66.253
1991	67.589
1992	17.605
1993	5.28
1994	14.528
1995	29.864
1996	9.208
1997	-0.166
1998	-12.845
1999	-0.307
2000	-0.632
2001	0.925
2002	4.119
2003	3.083
2004	9.822
2005	8.819
2006	6.699
2007	12.631
2008	19.891
2009	6.518
2010	11.748
2011	18.127
2012	6.816
2013	6.036
2014	1.839
2015	0.597
2016	4.737
2017	2.597
2018	2.983
2019	3.2
2020	3.4
2021	3.5
2022	3.6
2023	3.8
2024	4