Year	Percent change
1980	17.452
1981	12.104
1982	8.589
1983	8.873
1984	8.044
1985	7.373
1986	4.236
1987	4.189
1988	5.825
1989	6.443
1990	3.198
1991	8.79
1992	1.377
1993	4.689
1994	2.907
1995	2.469
1996	1.019
1997	1.818
1998	1.008
1999	0.57
2000	1.296
2001	2.68
2002	1.936
2003	2.319
2004	1.02
2005	0.836
2006	1.499
2007	1.68
2008	3.348
2009	1.937
2010	1.901
2011	1.36
2012	0.937
2013	0.443
2014	0.209
2015	0.705
2016	1.138
2017	1.866
2018	2.035
2019	1.851
2020	1.685
2021	1.9
2022	2
2023	2
2024	2