Year	Percent change
1980	13.704
1981	13.681
1982	12.034
1983	11.509
1984	10.55
1985	6.224
1986	3.711
1987	3.766
1988	3.811
1989	6.643
1990	10.834
1991	11.7
1992	9.45
1993	7.474
1994	10.671
1995	8.342
1996	0.851
1997	3.253
1998	3.816
1999	1.665
2000	-6.609
2001	-10.28
2002	-7.268
2003	-1.259
2004	-3.461
2005	3.006
2006	7.229
2007	7.581
2008	9.728
2009	0.328
2010	3.325
2011	26.646
2012	-3.674
2013	1.704
2014	7.138
2015	15.718
2016	25
2017	33.994
2018	15
2019	15
2020	15
2021	15
2022	15
2023	15
2024	15