Year	Percent change
1980	13.049
1981	16.387
1982	16.258
1983	48.434
1984	31.23
1985	27.983
1986	23.03
1987	29.504
1988	58.216
1989	75.648
1990	48.519
1991	48.804
1992	54.341
1993	45
1994	27.443
1995	22.886
1996	24.4
1997	30.6
1998	36.1
1999	52.2
2000	96.1
2001	37.674
2002	12.485
2003	7.929
2004	2.741
2005	2.17
2006	3.299
2007	2.276
2008	8.4
2009	5.16
2010	3.554
2011	4.475
2012	5.102
2013	2.722
2014	3.589
2015	3.966
2016	1.728
2017	0.417
2018	-0.224
2019	0.577
2020	1.241
2021	1.598
2022	1.303
2023	1.09
2024	0.962