Year	Percent
1980	153.54336
1981	166.3635
1982	159.79692
1983	132.63061
1984	77.16645
1985	71.64488
1986	68.0751
1987	78.71509
1988	75.85531
1989	79.19365
1990	85.453
1991	76.93009
1992	78.02659
1993	67.12859
1994	77.73587
2006	49.334
2007	96.5477
2008	86.71028
2009	73.00565
2010	77.56179
2011	88.0279
2012	85.75581
2013	88.39479
2014	89.29191
2015	78.49281
2016	74.53754
2017	72.81053