Year	Percent change
1980	31.238
1981	11.17
1982	20.687
1983	23.418
1984	23.599
1985	26.837
1986	17.349
1987	21.133
1988	12.3
1989	21.199
1990	27.235
1991	18.775
1992	12.932
1993	12.472
1994	9.166
1995	8.337
1996	6.695
1997	6.041
1998	4.663
1999	2.318
2000	4.554
2001	2.666
2002	2.866
2003	1.1
2004	2.444
2005	3.671
2006	2.607
2007	7.861
2008	7.089
2009	-1.507
2010	2.942
2011	4.389
2012	1.458
2013	3.056
2014	4.698
2015	4.429
2016	2.735
2017	2.274
2018	2.14
2019	2.651
2020	3.001
2021	3.001
2022	3.001
2023	3.001
2024	3.001