Year	Percent change
1980	-1.78
1981	8.024
1982	-7.188
1983	-5.25
1984	4.451
1985	-2.522
1986	-19.269
1987	5.304
1988	-2.623
1989	15.733
1990	23.562
1991	2.141
1992	3.095
1993	-0.029
1994	7.363
1995	6.58
1996	5.34
1997	8.553
1998	0.791
1999	3.751
2000	12.329
2001	1.284
2002	2.478
2003	8.813
2004	9.577
2005	4.867
2006	9.831
2007	3.231
2008	3.215
2009	-5.229
2010	1.595
2011	6.93
2012	4.485
2013	5.053
2014	4.399
2015	5.065
2016	2.988
2017	0.79
2018	1.692
2019	2.849
2020	3.322
2021	3.03
2022	2.898
2023	2.799
2024	2.662