Year	Percent change
1980	33.124
1981	-17.836
1982	-10.009
1983	3.312
1984	32.775
1985	5.045
1986	-3.568
1987	1.138
1988	2.005
1989	-14.931
1990	24.929
1991	5.344
1992	-2.903
1993	-5.105
1994	10.287
1995	-0.307
1996	16.899
1997	4.35
1998	24.399
1999	-16.568
2000	-6.753
2001	4.329
2002	8.173
2003	6.132
2004	10.26
2005	-11.38
2006	10.854
2007	44.601
2008	7.147
2009	-27.736
2010	40.949
2011	-8.668
2012	5.021
2013	22.393
2014	5.59
2015	-4.806
2016	-1.334
2017	12.295
2018	8.998
2019	2.189
2020	8.008
2021	6.317
2022	6.571
2023	7.251
2024	7.276