Year	Percent
1975-01-01	4.6460300000000005
1976-01-01	4.8643400000000000
1977-01-01	5.6853400000000000
1978-01-01	6.1515300000000000
1979-01-01	4.3967500000000000
1980-01-01	2.4806000000000000
1981-01-01	2.4232099999999996
1982-01-01	2.7888700000000000
1983-01-01	4.6243900000000000
1984-01-01	6.8843399999999990
1985-01-01	10.9040000000000020
1986-01-01	15.3552000000000000
1987-01-01	17.5262000000000000
1988-01-01	14.6659999999999990
1989-01-01	15.0312000000000000
1990-01-01	16.0745000000000000
1991-01-01	13.1915000000000000
1992-01-01	12.5774000000000000
1993-01-01	13.4175000000000000
1994-01-01	17.1924000000000000
1995-01-01	22.6847000000000000
1996-01-01	31.6884000000000000
1997-01-01	48.1087000000000000
1998-01-01	75.0933000000000000
1999-01-01	91.8672000000000000
2000-01-01	122.9360000000000000
2001-01-01	129.5110000000000000
2002-01-01	109.3600000000000000
2003-01-01	103.5500000000000000
2004-01-01	94.6317000000000000
2005-01-01	91.0718000000000000
2006-01-01	103.6910000000000000
2007-01-01	151.1260000000000000
2008-01-01	142.1060000000000000
2009-01-01	86.1871000000000000
2010-01-01	64.6482000000000000
2011-01-01	62.2653000000000000
2012-01-01	54.4514000000000000
2013-01-01	52.8388000000000000
2014-01-01	54.5202000000000000