Year	Percent change
1981	-0.592
1982	4.833
1983	20.796
1984	14.34
1985	8.319
1986	7.979
1987	10.135
1988	8.632
1989	18.697
1990	12.976
1991	0.451
1992	5.445
1993	1.304
1994	10.465
1995	13.588
1996	5.711
1997	1.249
1998	16.078
1999	-0.582
2000	-4.178
2001	4.324
2002	9.38
2003	15.906
2004	7.224
2005	-4.324
2006	10.318
2007	14.222
2008	2.342
2009	-15.336
2010	0.492
2011	10.64
2012	-3.919
2013	13.443
2014	4.936
2015	6.145
2016	4.003
2017	7.641
2018	5.636
2019	4.129
2020	4.072
2021	3.905
2022	3.849
2023	3.825
2024	3.825