Year	Percent
1975-01-01	17.85060000000000
1976-01-01	17.62640000000000
1977-01-01	17.77930000000000
1978-01-01	16.98800000000000
1979-01-01	16.33890000000000
1980-01-01	15.41240000000000
1981-01-01	14.08040000000000
1982-01-01	14.82960000000000
1983-01-01	19.02390000000000
1984-01-01	23.08410000000000
1985-01-01	33.00760000000000
1986-01-01	41.32480000000000
1987-01-01	38.73810000000000
1988-01-01	38.11070000000000
1989-01-01	49.84230000000000
1990-01-01	47.92140000000000
1991-01-01	44.15200000000000
1992-01-01	49.12310000000000
1993-01-01	49.42320000000000
1994-01-01	55.02200000000000
1995-01-01	60.78670000000000
1996-01-01	73.00980000000000
1997-01-01	96.32370000000000
1998-01-01	123.22600000000000
1999-01-01	144.57200000000000
2000-01-01	150.98500000000000
2001-01-01	133.82200000000000
2002-01-01	101.22500000000000
2003-01-01	85.61030000000000
2004-01-01	83.39920000000000
2005-01-01	84.17360000000000
2006-01-01	95.21480000000000
2007-01-01	108.32700000000001
2008-01-01	76.71260000000000
2009-01-01	54.52990000000000
2010-01-01	71.82420000000000
2011-01-01	72.78570000000000
2012-01-01	72.81530000000000
2013-01-01	86.69580000000000
2014-01-01	91.81470000000000
2015-01-01	91.97170000000000
2016-01-01	98.64700000000000
2017-01-01	116.56600000000000