Year	Percent change
1980	26.646
1981	4.207
1982	3.549
1983	-15.437
1984	-14.872
1985	-22.794
1986	-20.727
1987	4.253
1988	-7.84
1989	2.851
1990	-6.35
1991	3.209
1992	10.807
1993	-8.055
1994	-5.595
1995	37.027
1996	14.082
1997	27.585
1998	1.51
1999	1.474
2000	22.488
2001	5.622
2002	-3.961
2003	49.374
2004	17.105
2005	51.906
2006	57.999
2007	25.307
2008	5.918
2009	-10.865
2010	-1.425
2011	40.79
2012	21.54
2013	8.696
2014	6.434
2015	-9.173
2016	4.88
2017	-2.777
2018	-0.817
2019	2.065
2020	-0.356
2021	0.596
2022	3.207
2023	-2.195
2024	1.277