Year	Percent
1973-01-01	5.2538599999999995
1974-01-01	6.0087699999999990
1975-01-01	6.3949900000000000
1976-01-01	6.8278200000000000
1977-01-01	8.5944600000000000
1978-01-01	9.7197900000000000
1979-01-01	10.1298000000000000
1980-01-01	12.0732000000000000
1981-01-01	12.5629999999999990
1982-01-01	13.0012000000000000
1983-01-01	14.2326000000000000
1984-01-01	13.7735000000000000
1985-01-01	14.2253000000000000
1986-01-01	15.7391000000000000
1987-01-01	16.3780000000000000
1988-01-01	16.7919000000000000
1989-01-01	17.7079000000000000
1990-01-01	17.5790000000000000
1991-01-01	18.6605000000000000
1992-01-01	19.3314000000000000
1993-01-01	20.2041000000000000
1994-01-01	21.3038000000000000
1995-01-01	23.8838000000000000
1996-01-01	25.1215000000000000
1997-01-01	24.9477000000000000
1998-01-01	28.4670000000000000
1999-01-01	30.1882000000000000
2000-01-01	31.9130000000000000
2001-01-01	32.5726000000000000
2002-01-01	33.9229000000000000
2003-01-01	34.1513000000000000
2004-01-01	35.0989000000000000
2005-01-01	36.1129000000000000
2006-01-01	38.1526000000000000
2007-01-01	41.5482000000000000
2008-01-01	45.7034000000000000
2009-01-01	54.1823000000000000
2010-01-01	59.7406000000000000
2011-01-01	59.7383000000000000
2012-01-01	62.2739999999999940
2013-01-01	64.6564000000000000
2014-01-01	65.3277000000000000
2015-01-01	69.9065000000000000
2016-01-01	80.9518000000000000