Year	Percent change
1980	23.9
1981	19.3
1982	18.6
1983	7.2
1984	17.6
1985	69.4
1986	95.4
1987	487.2
1988	155
1989	72.2
1990	68.9
1991	50.115
1992	99.847
1993	24.737
1994	8.235
1995	10.282
1996	8.879
1997	7.748
1998	4.549
1999	0.241
2000	-0.356
2001	-0.367
2002	1.759
2003	1.268
2004	1.672
2005	-1.426
2006	4.092
2007	4.058
2008	10.698
2009	0.787
2010	3.983
2011	4.971
2012	6.581
2013	4.821
2014	1.799
2015	-3.696
2016	-0.816
2017	4.476
2018	6.068
2019	2.012
2020	2.334
2021	2.31
2022	2.282
2023	2.247
2024	2.293