Year	Percent change
1980	5.281
1981	6.006
1982	3.476
1983	7.289
1984	3.821
1985	5.254
1986	4.777
1987	3.965
1988	9.628
1989	5.947
1990	5.534
1991	1.057
1992	5.482
1993	4.75
1994	6.659
1995	7.575
1996	7.55
1997	4.05
1998	6.184
1999	8.463
2000	3.975
2001	4.944
2002	3.907
2003	7.944
2004	7.849
2005	9.285
2006	9.264
2007	9.801
2008	3.891
2009	8.48
2010	10.26
2011	6.638
2012	5.456
2013	6.386
2014	7.41
2015	7.996
2016	8.17
2017	7.168
2018	7.053
2019	7.257
2020	7.489
2021	7.74
2022	7.731
2023	7.742
2024	7.737