Year	Percent
1973-01-01	8.094360000000000
1974-01-01	10.630400000000000
1975-01-01	15.100800000000000
1976-01-01	19.012200000000000
1977-01-01	17.439100000000000
1978-01-01	15.539500000000000
1979-01-01	13.640999999999998
1980-01-01	12.561000000000000
1981-01-01	14.438800000000000
1982-01-01	18.544800000000000
1983-01-01	22.775400000000000
1984-01-01	27.734500000000000
1985-01-01	33.098400000000000
1986-01-01	44.017800000000000
1987-01-01	42.060900000000000
1988-01-01	43.745300000000000
1989-01-01	40.811600000000000
1990-01-01	31.405600000000000
1991-01-01	31.544300000000000
1992-01-01	32.916300000000000
1993-01-01	32.408200000000000
1994-01-01	30.947000000000000
1995-01-01	30.551600000000000
1996-01-01	29.763600000000000
1997-01-01	29.959300000000000
1998-01-01	33.024500000000000
1999-01-01	31.285400000000000
2000-01-01	28.407800000000000
2001-01-01	34.640400000000000
2002-01-01	38.137400000000000
2003-01-01	38.159800000000000
2004-01-01	38.630900000000000
2005-01-01	40.641900000000000
2006-01-01	46.272700000000000
2007-01-01	48.417600000000000
2008-01-01	53.053900000000000
2009-01-01	71.636700000000000
2010-01-01	67.916300000000000
2011-01-01	59.205700000000000
2012-01-01	58.084600000000000
2013-01-01	63.509800000000000
2014-01-01	70.519800000000000
2015-01-01	85.386100000000000
2016-01-01	90.134600000000000