Year	Percent change
1980	21.8
1981	19.51
1982	16.46
1983	14.7
1984	10.74
1985	8.969
1986	5.82
1987	4.72
1988	5.09
1989	6.245
1990	6.395
1991	6.222
1992	5.003
1993	4.497
1994	4.164
1995	5.393
1996	3.983
1997	1.849
1998	2.031
1999	1.651
2000	2.58
2001	2.324
2002	2.612
2003	2.813
2004	2.257
2005	2.207
2006	2.229
2007	2.025
2008	3.492
2009	0.765
2010	1.62
2011	2.935
2012	3.315
2013	1.245
2014	0.234
2015	0.108
2016	-0.05
2017	1.326
2018	1.243
2019	0.758
2020	1.192
2021	1.244
2022	1.442
2023	1.54
2024	1.62