Year	Percent change
1980	21.058
1981	22.227
1982	-7.915
1983	-15.436
1984	20.059
1985	30.465
1986	10.753
1987	30.479
1988	-20.393
1989	7.582
1990	-4.1
1991	6.4
1992	7.7
1993	2.3
1994	7.066
1995	8.7
1996	-2.691
1997	6.799
1998	2.818
1999	2.891
2000	7.859
2001	23.099
2002	15.01
2003	7.443
2004	22.491
2005	-1.613
2006	15.248
2007	-2.669
2008	2.357
2009	-15.032
2010	11.873
2011	3.007
2012	-7.706
2013	7.484
2014	3.649
2015	-1.941
2016	5.178
2017	-2.176
2018	1.428
2019	4.569
2020	4.812
2021	5.151
2022	5.189
2023	5.043
2024	5.238