Year	Percent change
1980	9.184
1981	6.002
1982	-8.913
1983	2.12
1984	14.269
1985	-3.554
1986	-1.809
1987	-1.06
1988	-4.351
1989	-23.016
1990	-39.401
1991	-17.909
1992	2.913
1993	11.124
1994	19.037
1995	15.085
1996	-7.046
1997	11.316
1998	-0.607
1999	5.3
2000	23.18
2001	11.907
2002	17.092
2003	9.28
2004	14.051
2005	7.583
2006	10.44
2007	7.844
2008	13.751
2009	-5.684
2010	15.524
2011	12.116
2012	1.105
2013	20.184
2014	8.022
2015	4.563
2016	16.012
2017	9.961
2018	6.739
2019	4.913
2020	6.073
2021	6.098
2022	5.997
2023	5.913
2024	5.719