Year	Percent change
1980	3.409
1981	2.198
1982	7.296
1983	8.876
1984	8.021
1985	7.425
1986	4.759
1987	4.273
1988	3.994
1989	2.993
1990	2.35
1991	2.1
1992	0.3
1993	2.9
1994	4.188
1995	4.484
1996	4.879
1997	5.919
1998	7.543
1999	6.11
2000	5.383
2001	3.524
2002	3.186
2003	3.193
2004	4.092
2005	4.472
2006	6.844
2007	7.088
2008	7.156
2009	4.674
2010	5.147
2011	1.765
2012	2.226
2013	3.302
2014	2.916
2015	4.372
2016	4.347
2017	4.181
2018	5.314
2019	5.488
2020	5.89
2021	6
2022	6.012
2023	5.992
2024	6.044