Year	Percent change
1980	10.909
1981	7.65
1982	7.614
1983	4.953
1984	4.045
1985	2.808
1987	-0.21
1988	6.705
1989	25.668
1990	16.192
1991	8.155
1992	4.017
1993	3.304
1994	3.524
1995	2.353
1996	6.501
1997	3.038
1998	3.079
1999	0.598
2000	0.674
2001	1.768
2002	1.835
2003	1.627
2004	3.365
2005	3.491
2006	6.255
2007	4.744
2008	13.971
2009	-0.739
2010	4.846
2011	4.162
2012	4.515
2013	4.825
2014	2.899
2015	-0.877
2016	-0.778
2017	3.324
2018	4.462
2019	2.02
2020	2.498
2021	2.51
2022	2.52
2023	2.52
2024	2.52