Year	Percent
1975-01-01	26.4305000000000000
1976-01-01	27.7038000000000000
1977-01-01	15.8742000000000000
1978-01-01	3.0729900000000003
1979-01-01	14.9573000000000000
1980-01-01	30.0857000000000000
1981-01-01	33.3317000000000000
1982-01-01	34.7629000000000000
1983-01-01	39.6169000000000000
1984-01-01	45.2337000000000000
1985-01-01	56.9207000000000000
1986-01-01	75.4691000000000000
1987-01-01	95.0346000000000000
1988-01-01	111.7080000000000000
1989-01-01	127.7270000000000000
1990-01-01	112.2520000000000100
1991-01-01	86.2063000000000000
1992-01-01	69.9660000000000100
1993-01-01	61.6637000000000000
1994-01-01	68.9726000000000000
1995-01-01	68.3470000000000000
1996-01-01	62.9754000000000000
1997-01-01	54.7391000000000000
1998-01-01	54.1331000000000000
1999-01-01	79.5932000000000000
2000-01-01	80.4366000000000000
2001-01-01	58.8365000000000000
2002-01-01	51.7552000000000000
2003-01-01	58.4013000000000000
2004-01-01	69.8628000000000000
2005-01-01	84.7512000000000000
2006-01-01	98.9617000000000000
2007-01-01	98.1964000000000000
2008-01-01	80.3854000000000000
2009-01-01	64.4049000000000000
2010-01-01	64.6110000000000000
2011-01-01	61.2892000000000000
2012-01-01	55.0323000000000000
2013-01-01	71.4735000000000000
2014-01-01	88.8581000000000000
2015-01-01	99.5242000000000000
2016-01-01	105.0179999999999900
2017-01-01	112.7720000000000000