Year	Percent change
1981	9.521
1982	23.339
1983	29.701
1984	29.79
1985	33.893
1986	41.397
1987	185.325
1988	51.327
1989	28.38
1990	47.099
1991	35.214
1992	54.5
1993	43.638
1994	56.558
1995	56.537
1996	19.343
1997	6.197
1998	-0.956
1999	6.216
2000	11.438
2001	21.935
2002	9.119
2003	13.815
2004	9.067
2005	11.148
2006	9.374
2007	10.264
2008	11.817
2009	2.258
2010	17.44
2011	6.14
2012	2.016
2013	3.537
2014	1.927
2015	10.554
2016	23.666
2017	5.648
2018	3.524
2019	5.501
2020	5.501
2021	5.501
2022	5.501
2023	5.501
2024	5.501