Year	Percent
1972-01-01	0.812705000000000
1973-01-01	3.108950000000000
1974-01-01	2.761040000000000
1975-01-01	2.690640000000000
1976-01-01	4.232190000000000
1977-01-01	13.739900000000000
1978-01-01	15.824400000000000
1979-01-01	15.635200000000000
1980-01-01	13.895999999999999
1981-01-01	16.915800000000000
1982-01-01	20.988300000000000
1983-01-01	20.304500000000000
1984-01-01	19.739300000000000
1985-01-01	21.609900000000000
1986-01-01	16.153100000000000
1987-01-01	16.519200000000000
1988-01-01	10.266500000000000
1989-01-01	11.692200000000000
1990-01-01	38.105000000000000
1991-01-01	22.818200000000000
1992-01-01	25.252500000000000
1993-01-01	12.537200000000000
1994-01-01	15.022500000000000
1995-01-01	24.745000000000000
1996-01-01	37.852500000000000
1997-01-01	45.358000000000004
1998-01-01	49.349000000000000
1999-01-01	46.901600000000000
2000-01-01	65.003400000000000
2001-01-01	106.514000000000000
2002-01-01	144.362000000000000
2003-01-01	164.670000000000000
2004-01-01	171.877000000000000
2005-01-01	174.765000000000000
2006-01-01	211.933000000000000
2007-01-01	180.559000000000030
2008-01-01	173.129000000000020
2009-01-01	182.424000000000000
2010-01-01	165.033000000000000
2011-01-01	149.207000000000000
2012-01-01	153.746000000000000
2013-01-01	178.580000000000000
2014-01-01	178.481000000000000
2015-01-01	245.789000000000020
2016-01-01	292.857000000000000