Year	Percent change
1980	-10.06
1981	5.882
1982	5.497
1983	0.384
1984	4.775
1985	6.876
1986	9.742
1987	10.163
1988	6.791
1989	4.465
1990	7.187
1991	4.435
1992	6.513
1993	5.082
1994	4.136
1995	4.288
1996	5.588
1997	5.687
1998	6.072
1999	2.611
2000	8.192
2001	3.214
2002	1.627
2003	5.984
2004	4.299
2005	1.453
2006	4.514
2007	5.727
2008	5.387
2009	3.315
2010	4.377
2011	4.077
2012	3.496
2013	3.36
2014	3.745
2015	3.553
2016	3.838
2017	3.809
2018	3.76
2019	3.86
2020	3.93
2021	4.011
2022	4.011
2023	4.011
2024	4.011