Year	Percent
1980	50.76775
1981	28.00016
1982	47.17664
1983	45.59463
1984	41.91295
1985	68.16216
1986	173.5596
1987	98.17293
1988	163.24537
1989	127.01573
1990	70.2077
1991	121.35149
1992	233.79011
1993	346.60961
1994	346.46603
1995	437.43364
1996	175.61702
1997	-572.52146
1998	298.18178
1999	3760.91807
2000	2590.06883
2001	283.20243
2002	262.55913
2003	217.27143
2004	252.2168
2005	183.13843
2006	198.81271
2007	271.04935
2008	167.27001
2009	186.00115
2010	57.18137
2011	34.35755
2012	41.52272
2013	66.32216
2014	133.13744
2015	144.54995
2016	93.7559
2017	78.25306
2018	83.88856
2019	110.83854
2020	170.99705
2021	146.83893