Year	Percent
1975-01-01	2.5792900000000003
1976-01-01	2.6835299999999997
1977-01-01	5.3501199999999995
1978-01-01	8.6842500000000000
1979-01-01	8.8205800000000000
1980-01-01	8.5654800000000000
1981-01-01	11.0620000000000010
1982-01-01	14.4895000000000000
1983-01-01	21.8192000000000000
1984-01-01	25.0328000000000000
1985-01-01	27.5549000000000000
1986-01-01	36.5584000000000000
1987-01-01	39.3691000000000000
1988-01-01	42.3330000000000000
1989-01-01	49.9837000000000000
1990-01-01	44.3758000000000000
1991-01-01	35.3610000000000000
1992-01-01	31.8951000000000000
1993-01-01	38.2462000000000000
1994-01-01	48.9843000000000000
1995-01-01	57.3801000000000000
1996-01-01	73.7393000000000000
1997-01-01	90.0125000000000000
1998-01-01	99.5778000000000000
1999-01-01	118.3990000000000000
2000-01-01	127.7890000000000000
2001-01-01	110.6190000000000000
2002-01-01	81.7887000000000000
2003-01-01	76.6299000000000000
2004-01-01	91.1861000000000000
2005-01-01	99.4556000000000000
2006-01-01	116.8330000000000000
2007-01-01	126.6040000000000000
2008-01-01	86.6540000000000000
2009-01-01	75.3328000000000000
2010-01-01	105.7560000000000000
2011-01-01	99.2636000000000000
2012-01-01	92.8092000000000000