Year	Percent change
1980	7.661
1981	5.461
1982	-0.324
1983	-9.329
1984	3.801
1985	2.089
1986	12.106
1987	7.738
1988	-9.422
1989	-13.422
1990	-5.09
1991	2.219
1992	-0.541
1993	5.244
1994	12.308
1995	7.412
1996	2.799
1997	6.476
1998	-0.392
1999	1.495
2000	2.695
2001	0.617
2002	5.454
2003	4.165
2004	4.959
2005	6.285
2006	7.529
2007	8.518
2008	9.143
2009	1.049
2010	8.451
2011	6.452
2012	5.951
2013	5.837
2014	2.394
2015	3.274
2016	4.043
2017	2.475
2018	3.994
2019	3.933
2020	3.976
2021	3.957
2022	3.901
2023	3.808
2024	3.76