Year	Percent change
1980	99.203
1981	100
1982	100
1983	150
1984	16.711
1985	100
1986	143.8
1987	215.4
1988	166.7
1989	130.8
1990	45.4
1991	20.819
1992	42.248
1993	29.969
1994	5.85
1995	6.787
1996	7.516
1997	7.729
1998	5.834
1999	5.759
2000	3.382
2001	1.922
2002	-0.3
2003	8.71
2004	3.666
2005	8.602
2006	7.219
2007	6.09
2008	12.044
2009	13.017
2010	3.716
2011	15.009
2012	12.679
2013	4.905
2014	3.076
2015	5.412
2016	5.455
2017	5.629
2018	2.625
2019	3.6
2020	4.389
2021	4.889
2022	5
2023	5
2024	5