Year	Percent change
1980	25.699
1981	21.267
1982	-7.894
1983	18.832
1984	18.851
1985	2.227
1986	-18.773
1987	19.35
1988	17.13
1989	0.154
1990	-7.689
1991	3.459
1992	14.251
1993	12.525
1994	7.67
1995	10.425
1996	2.712
1997	9.919
1998	3.773
1999	8.301
2000	10.908
2001	9.087
2002	8.658
2003	15.605
2004	18.962
2005	9.379
2006	3.566
2007	5.502
2008	-2.27
2009	-10.581
2010	8.749
2011	3.012
2012	-0.253
2013	2.993
2014	-2.053
2015	8.135
2016	3.439
2017	13.464
2018	8.629
2019	4.207
2020	4.545
2021	4.671
2022	5.339
2023	4.727
2024	4.461