Year	Percent change
1980	8.487
1981	29.011
1982	19.315
1983	11.176
1984	28.085
1985	7.667
1986	6.614
1987	34.562
1988	36.295
1989	104.3
1990	75.3
1991	79
1992	12.5
1993	6.8
1994	16.095
1995	8.106
1996	4.485
1997	4.153
1998	4.77
1999	8.622
2000	5.864
2001	1.502
2002	6.089
2003	5.014
2004	5.457
2005	8.279
2006	4.163
2007	14.033
2008	6.37
2009	3.65
2010	4.43
2011	3.304
2012	3.476
2013	0.887
2014	1.172
2015	-1.814
2016	1.454
2017	1.485
2018	2.181
2019	3.042
2020	3.165
2021	3.536
2022	3.536
2023	3.103
2024	2.549