Year	Percent change
1980	14.804
1981	29.171
1982	0.47
1983	50.643
1984	-15.511
1985	-17.736
1986	-25.31
1987	2.238
1988	-17.303
1989	27.349
1990	25.1
1991	31.686
1992	-10.513
1993	-19.307
1994	-36.189
1995	-1.078
1996	14.825
1997	-7.662
1998	-0.242
1999	-6.711
2000	8.086
2001	24.562
2002	17.641
2003	22.275
2004	17.349
2005	5.849
2006	7.985
2007	7.32
2008	13.127
2009	4.201
2010	0.743
2011	-4.914
2012	-13.152
2013	-8.902
2014	23.499
2015	-9.508
2016	13.096
2017	13.948
2018	-9.137
2019	-10.524
2020	-2.399
2021	-2.372
2022	-0.529
2023	-0.85
2024	1.955