Year	Percent change
1981	10.966
1982	16.601
1983	-0.173
1984	-3.132
1985	4.573
1986	1.403
1987	-0.498
1988	0.691
1989	-2.981
1990	1.534
1991	5.035
1992	-2.109
1993	2.351
1994	48.498
1995	6.393
1996	4.906
1997	3.032
1998	-1.391
1999	4.511
2000	-2.491
2001	6.855
2002	1.552
2003	-1.733
2004	3.918
2005	5.471
2006	1.462
2007	3.412
2008	10.27
2009	0.571
2010	3.758
2011	1.465
2012	2.801
2013	-0.403
2014	1.832
2015	1.621
2016	0.455
2017	-1.551
2018	1.97
2019	2.77
2020	1.359
2021	2.542
2022	1.547
2023	2.383
2024	2