Year	Percent change
1980	316.595
1981	116.808
1982	120.365
1983	145.637
1984	373.821
1985	304.584
1986	48.155
1987	19.853
1988	16.231
1989	20.249
1990	17.173
1991	19.006
1992	11.948
1993	10.944
1994	12.342
1995	10.043
1996	11.277
1997	9.001
1998	5.435
1999	5.194
2000	1.125
2001	1.116
2002	5.687
2003	0.65
2004	-0.4
2005	1.351
2006	2.095
2007	0.528
2008	4.589
2009	3.307
2010	2.706
2011	3.429
2012	1.718
2013	1.511
2014	0.485
2015	-0.632
2016	-0.544
2017	0.244
2018	0.815
2019	0.885
2020	1.672
2021	1.998
2022	1.998
2023	1.998
2024	1.998