Year	Percent change
1980	-19.05
1981	16.795
1982	2.045
1983	-35.747
1984	17.448
1985	46.196
1986	-7.475
1987	-10.786
1988	-16.257
1989	61.113
1990	15.938
1991	62.085
1992	-5.655
1993	0.481
1994	26.493
1995	58.498
1996	-7.799
1997	23.488
1998	-24.672
1999	-1.011
2000	43.418
2001	-8.623
2002	10.985
2003	52.563
2004	2.058
2005	18.873
2006	-48.312
2007	60.618
2008	51.137
2009	-25.369
2010	-8.696
2011	-6.402
2012	19.77
2013	102.111
2014	27.191
2015	19.212
2016	-3.402
2017	57.005
2018	51.661
2019	43.875
2020	34.547
2021	34.443
2022	30.303
2023	21.168
2024	17.03