Year	Percent change
1980	17.986
1981	64.935
1982	82.677
1983	10.345
1984	17.578
1985	10.963
1986	15.269
1987	16.623
1988	25.167
1989	9.964
1990	27.346
1991	25.286
1992	16.937
1993	9.02
1994	19.889
1995	22.561
1996	13.914
1997	11.169
1998	12.356
1999	10.122
2000	10.263
2001	10.937
2002	9.689
2003	9.864
2004	13.127
2005	14.07
2006	9.446
2007	10.805
2008	13.901
2009	4.037
2010	5.827
2011	4.742
2012	4.55
2013	3.676
2014	5.124
2015	-0.801
2016	0.767
2017	2.573
2018	2
2019	3.21
2020	3
2021	3
2022	3
2023	3
2024	3