Year	Percent change
1980	19.079
1981	10.858
1982	7.359
1983	10.244
1984	6.402
1985	10.649
1986	3.28
1987	-11.449
1988	4.105
1989	6.924
1990	21.276
1991	15.42
1992	19.358
1993	22.556
1994	42.557
1995	30.2
1996	20.584
1997	16.177
1998	12.722
1999	8.126
2000	11.459
2001	16.492
2002	9.345
2003	26.734
2004	28.316
2005	16.762
2006	14.21
2007	8.958
2008	14.381
2009	3.429
2010	4.136
2011	7.385
2012	6.78
2013	6.776
2014	3.944
2015	7.524
2016	13.378
2017	14.738
2018	13.478
2019	14.944
2020	12.953
2021	12.229
2022	11.448
2023	10.725
2024	10.225