Year	Percent change
1980	14.7
1981	13.849
1982	-0.942
1983	12.076
1984	19.1
1985	5.463
1986	14.585
1987	28.409
1988	21.531
1989	8.258
1990	8.183
1991	14.423
1992	17.542
1993	12.378
1994	9.435
1995	9.913
1996	5.648
1997	4.812
1998	-4.458
1999	4.519
2000	16.878
2001	-1.048
2002	8.566
2003	13.085
2004	16.111
2005	12.166
2006	10.176
2007	8.153
2008	3.501
2009	-9.256
2010	17.561
2011	4.806
2012	3.206
2013	7.826
2014	0.969
2015	-1.379
2016	0.692
2017	5.876
2018	3.758
2019	2.334
2020	2.981
2021	3.377
2022	3.528
2023	3.615
2024	3.628