Year	Percent change
1980	21.348
1981	7.444
1982	4.069
1983	2.675
1984	2.004
1985	3.536
1986	3.036
1987	2.947
1988	5.188
1989	8.163
1990	4.637
1991	2.006
1992	4.314
1993	1.594
1994	-0.237
1995	1.398
1996	2.031
1997	2.173
1998	1.539
1999	-0.042
2000	1.108
2001	1.128
2002	0.358
2003	2.832
2004	0.818
2005	2.703
2006	1.795
2007	6.011
2008	2.016
2009	3.176
2010	0.048
2011	1.936
2012	1.266
2013	-0.44
2014	0.461
2015	-0.654
2016	-0.18
2017	1.377
2018	1.358
2019	1.761
2020	1.831
2021	2
2022	2
2023	2
2024	2