Year	Percent change
1980	32.922
1981	20.762
1982	24.988
1983	-5.672
1984	14.124
1985	15.717
1986	-34.03
1987	-30.995
1988	9.564
1989	0.9
1990	11.2
1991	14.971
1992	16.388
1993	13.791
1994	-13.387
1995	3.992
1996	4.265
1997	10.897
1998	20.109
1999	-15.394
2000	5.742
2001	21.068
2002	6.255
2003	2.467
2004	17.295
2005	-3.994
2006	10.813
2007	36.129
2008	36.722
2009	-18.782
2010	1.473
2011	11.809
2012	19.494
2013	29.918
2014	-10.695
2015	1.905
2016	-16.024
2017	10.471
2018	1.288
2019	1.69
2020	3.679
2021	4.166
2022	4.663
2023	5.036
2024	5.412