Year	Percent
1980	35.90584
1981	35.18282
1982	34.68363
1983	39.60063
1984	37.70736
1985	78.044
1986	83.27693
1987	67.04328
1988	67.0536
1989	84.58876
1990	61.08292
1991	72.6417
1992	71.42305
1993	102.46875
1994	97.37917
1995	116.19447
1996	121.2647
1997	200.80312
1998	233.59107
1999	233.9437
2000	291.2332
2001	189.26659
2002	203.26243
2003	206.02784
2004	210.34359
2005	229.68488
2006	281.38191
2007	265.6016
2008	158.80094
2009	196.61565
2010	210.58451
2011	155.73915
2012	184.63449
2013	223.77494
2014	210.85039
2015	223.66373
2016	209.84905
2017	248.42076