Year	Percent change
1980	5.149
1981	3.423
1982	3.619
1983	1.875
1984	-7.324
1985	-7.307
1986	3.417
1987	4.312
1988	6.753
1989	6.205
1990	3.037
1991	-0.578
1992	0.338
1993	2.116
1994	4.388
1995	4.679
1996	5.846
1997	5.185
1998	-0.577
1999	3.082
2000	4.411
2001	2.894
2002	3.646
2003	4.97
2004	6.698
2005	4.778
2006	5.243
2007	6.617
2008	4.153
2009	1.148
2010	7.632
2011	3.66
2012	6.684
2013	7.064
2014	6.145
2015	6.067
2016	6.876
2017	6.685
2018	6.202
2019	6.476
2020	6.609
2021	6.737
2022	6.719
2023	6.77
2024	6.785