Year	Percent change
1980	16.331
1981	-11.931
1982	-15.656
1983	1.331
1984	3.884
1985	7.221
1986	6.862
1987	14.347
1988	26.189
1989	10.7
1990	13.269
1991	7.525
1992	9.668
1993	5.296
1994	7.123
1995	5.366
1996	-5.899
1997	3.975
1998	8.141
1999	8.231
2000	5.582
2001	-3.979
2002	6.312
2003	-0.342
2004	-2.104
2005	4.303
2006	17.511
2007	10.865
2008	19.409
2009	-0.438
2010	6.883
2011	1.547
2012	6.992
2013	0.933
2014	4.14
2015	14.85
2016	4.369
2017	5.343
2018	1.64
2019	2.24
2020	2.225
2021	2.23
2022	2.17
2023	2.14
2024	2.14