Year	Percent
1980	62.07275
1981	41.61406
1982	49.73287
1983	55.14049
1984	64.47721
1985	191.94302
1986	113.92938
1987	166.08097
1988	204.33608
1989	165.60337
1990	179.93874
1991	150.24004
1992	265.57711
1993	197.53468
1994	238.86094
1995	141.85535
1996	139.59675
1997	129.0189
1998	100.33005
1999	42.5873
2000	54.58491
2001	81.56761
2002	135.1555
2003	72.95655
2004	84.52646
2005	87.79095
2006	109.77875
2007	125.94768
2008	100.50765
2009	125.65177
2010	104.59481
2011	61.2826
2012	30.08292
2013	26.50573
2014	22.4279
2015	27.05549
2016	36.29415