Year	Percent change
1980	0.453
1981	-3.629
1982	-8.088
1983	-5.876
1984	9.318
1985	6.542
1986	6.318
1987	6.651
1988	6.177
1989	4.308
1990	3.476
1991	4.722
1992	4.113
1993	4.581
1994	3.445
1995	4.151
1996	4.771
1997	5.834
1998	4.942
1999	4.608
2000	3.727
2001	4.066
2002	4.631
2003	5.114
2004	5.47
2005	6.209
2006	5.96
2007	4.008
2008	9.253
2009	5.496
2010	7.942
2011	17.407
2012	8.981
2013	7.934
2014	2.897
2015	2.178
2016	3.448
2017	8.143
2018	5.643
2019	8.79
2020	5.837
2021	4.43
2022	4.468
2023	5.016
2024	3.778