Year	Percent
1973-01-01	30.08100000000000
1974-01-01	31.12060000000000
1975-01-01	31.51950000000000
1976-01-01	28.75440000000000
1977-01-01	28.47960000000000
1978-01-01	29.16240000000000
1979-01-01	32.12060000000000
1980-01-01	37.21280000000000
1981-01-01	39.45030000000000
1982-01-01	42.95800000000000
1983-01-01	44.12590000000000
1984-01-01	44.31630000000000
1985-01-01	45.88690000000000
1986-01-01	46.04800000000000
1987-01-01	44.52120000000000
1988-01-01	42.43010000000000
1989-01-01	44.09000000000000
1990-01-01	45.92220000000000
1991-01-01	46.61250000000000
1992-01-01	46.95190000000000
1993-01-01	46.28720000000000
1994-01-01	45.79370000000000
1995-01-01	45.50290000000000
1996-01-01	47.59910000000000
1997-01-01	51.47930000000000
1998-01-01	61.65940000000000
1999-01-01	64.11540000000000
2000-01-01	70.01090000000000
2001-01-01	76.34430000000000
2002-01-01	80.40410000000000
2003-01-01	85.76620000000000
2004-01-01	83.97160000000000
2005-01-01	84.37650000000000
2006-01-01	89.97500000000000
2007-01-01	94.22580000000000
2008-01-01	101.50500000000000
2009-01-01	104.80000000000000
2010-01-01	98.42090000000000
2011-01-01	98.53030000000000
2012-01-01	97.29700000000001
2013-01-01	119.62200000000001
2014-01-01	144.19100000000000
2015-01-01	146.44500000000000
2016-01-01	148.28300000000000