Year	Percent
1975-01-01	44.679200000000000
1976-01-01	34.343300000000000
1977-01-01	20.945700000000000
1978-01-01	15.238500000000000
1979-01-01	27.709600000000000
1980-01-01	101.204000000000000
1981-01-01	30.634800000000000
1982-01-01	17.985600000000000
1983-01-01	21.497200000000000
1984-01-01	22.183500000000000
1985-01-01	26.076999999999998
1986-01-01	25.805600000000000
1987-01-01	70.610100000000000
1988-01-01	40.477600000000000
1989-01-01	43.189500000000000
1990-01-01	34.758200000000000
1991-01-01	36.133900000000000
1992-01-01	33.744200000000000
1993-01-01	42.371100000000000
1994-01-01	40.869500000000000
1995-01-01	39.925500000000000
1996-01-01	38.920900000000000
1997-01-01	43.360000000000000
1998-01-01	47.671400000000000
1999-01-01	54.871400000000000
2000-01-01	68.846000000000000
2001-01-01	82.302800000000000
2002-01-01	51.199400000000000
2003-01-01	56.175700000000000
2004-01-01	58.771900000000000
2005-01-01	59.186200000000000
2006-01-01	80.561800000000000
2007-01-01	99.455000000000000
2008-01-01	100.277000000000000
2009-01-01	156.760000000000000
2010-01-01	102.527999999999990
2011-01-01	96.606400000000000
2012-01-01	84.886600000000000