Year	Percent
1973-01-01	15.98740
1974-01-01	7.95377
1975-01-01	9.50709
1976-01-01	10.31220
1977-01-01	14.04420
1978-01-01	17.03780
1979-01-01	17.03780
1980-01-01	17.03780
1981-01-01	17.03780
1982-01-01	17.03780
1983-01-01	17.03780
1984-01-01	17.03780
1985-01-01	17.03780
1986-01-01	17.03780
1987-01-01	17.03780
1988-01-01	17.03780
1989-01-01	17.03780
1990-01-01	17.03780
1991-01-01	17.03780
1992-01-01	17.03780
1993-01-01	17.03780
1994-01-01	17.03780
1995-01-01	17.03780
1996-01-01	17.03780
1997-01-01	17.03780
1998-01-01	17.03780
1999-01-01	17.03780
2000-01-01	17.03780
2001-01-01	17.03780
2002-01-01	61.68410
2003-01-01	55.50180
2004-01-01	46.95230
2005-01-01	42.75730
2006-01-01	41.83130
2007-01-01	45.82920
2008-01-01	49.32450
2009-01-01	73.78320
2010-01-01	69.56070
2011-01-01	67.99790
2012-01-01	78.42150
2013-01-01	85.14410
2014-01-01	88.60880
2015-01-01	120.07900
2016-01-01	147.64500