Year	Percent change
1980	38.319
1981	-20.338
1982	-9.508
1983	3.68
1984	33.385
1985	4.666
1986	-2.1
1987	1.618
1988	1.556
1989	-15.682
1990	26.211
1991	5.888
1992	-0.846
1993	-4.753
1994	9.529
1995	1.735
1996	15.613
1997	4.518
1998	23.87
1999	-20.644
2000	-6.574
2001	4.329
2002	8.173
2003	6.132
2004	10.26
2005	-11.38
2006	10.854
2007	44.601
2008	7.147
2009	-27.736
2010	40.949
2011	-8.668
2012	5.021
2013	22.393
2014	5.59
2015	-4.806
2016	-1.334
2017	12.295
2018	8.998
2019	2.189
2020	8.008
2021	6.317
2022	6.571
2023	7.251
2024	7.276