Year	Percent
1969-01-01	0.12197100000000001
1970-01-01	0.19454800000000000
1971-01-01	0.41502200000000000
1972-01-01	1.63950999999999980
1973-01-01	2.41316000000000000
1974-01-01	3.31901999999999960
1975-01-01	5.69451000000000000
1976-01-01	8.93813000000000100
1977-01-01	11.12080000000000000
1978-01-01	13.28760000000000000
1979-01-01	13.58770000000000000
1980-01-01	12.80099999999999800
1981-01-01	14.18150000000000000
1982-01-01	16.68900000000000000
1983-01-01	16.43500000000000000
1984-01-01	16.72840000000000000
1985-01-01	17.95770000000000000
1986-01-01	21.45760000000000000
1987-01-01	20.51830000000000000
1988-01-01	18.59920000000000000
1989-01-01	17.17020000000000000
1990-01-01	17.64740000000000000
1991-01-01	19.39970000000000000
1992-01-01	20.79740000000000000
1993-01-01	24.52740000000000000
1994-01-01	27.49080000000000000
1995-01-01	27.90980000000000000
1996-01-01	27.39430000000000000
1997-01-01	26.88420000000000000
1998-01-01	31.45850000000000000
1999-01-01	30.66590000000000000
2000-01-01	26.36090000000000000
2001-01-01	28.65570000000000000
2002-01-01	30.22860000000000000
2003-01-01	29.40250000000000000
2004-01-01	28.16500000000000000
2005-01-01	25.82850000000000000
2006-01-01	26.02070000000000000
2007-01-01	29.22830000000000000
2008-01-01	28.63240000000000000
2009-01-01	38.96980000000000000
2010-01-01	38.08650000000000000
2011-01-01	36.24120000000000000
2012-01-01	37.79460000000000000
2013-01-01	40.49270000000000000
2014-01-01	41.65590000000000000
2015-01-01	48.89730000000000000
2016-01-01	53.61330000000000000