Year	Percent
1980	567.8783
1981	402.88687
1982	364.02527
1983	367.39499
1984	292.79523
1985	313.59354
1986	283.24985
1987	300.77998
1988	329.1008
1989	232.5857
1990	256.64064
1991	169.51083
1992	209.40638
1993	195.77078
1994	169.59536
1995	193.93358
1996	146.59789
1997	120.41164
1998	86.71197
1999	118.93518
2000	213.48533
2001	182.66149
2002	127.10997
2003	164.10807
2004	261.82603
2005	282.40969
2006	277.80781
2007	260.37659
2008	215.82864
2009	199.70681
2010	206.52991
2011	205.19378
2012	176.10237
2013	153.8848
2014	118.80657
2015	91.1201
2016	73.8942
2017	64.97523
2018	63.25261
2019	60.927
2020	83.40312