Year	Percent change
1980	27.083
1981	22.951
1982	18.667
1983	20.225
1984	17.757
1985	25.397
1986	17.089
1987	15.676
1988	14.019
1989	15.164
1990	22.776
1991	17.681
1992	14.532
1993	12.043
1994	10.749
1995	7.75
1996	6.95
1997	4.543
1998	3.696
1999	2.313
2000	3.669
2001	3.525
2002	3.498
2003	3.098
2004	3.129
2005	3.504
2006	3.199
2007	3.855
2008	2.193
2009	2.549
2010	5.158
2011	2.177
2012	0.318
2013	-1.816
2014	-2.535
2015	0.392
2016	0.29
2017	0.967
2018	0.632
2019	0.789
2020	1.641
2021	1.576
2022	1.724
2023	1.777
2024	1.777