Year	Percent change
1980	193.663
1981	-16.754
1982	43.328
1983	-35.057
1984	-26.079
1985	-22.806
1986	24.488
1987	4.217
1988	-17.082
1989	3.286
1990	1.61
1991	1.942
1992	2.004
1993	2.193
1994	-1.709
1995	-1.391
1996	-1.818
1997	15.744
1998	-3.904
1999	17.786
2000	-0.787
2001	9.337
2002	-13.538
2003	75.7
2004	-4.101
2005	3.405
2006	3.005
2007	4.031
2008	19.968
2009	5.323
2010	-9.874
2011	5.276
2012	-12.016
2013	0.703
2014	-6.26
2015	20.331
2016	0.813
2017	-4.109
2018	2.438
2019	7.095
2020	4.234
2021	4.24
2022	4.753
2023	5.421
2024	6.147