Year	Percent
1977-01-01	0.012476000000000001
1978-01-01	0.012825000000000000
1979-01-01	0.015165999999999999
1980-01-01	0.012665000000000001
1981-01-01	0.015587000000000000
1982-01-01	0.018510000000000000
1983-01-01	0.014477000000000000
1984-01-01	0.015929000000000000
1985-01-01	0.015929000000000000
1986-01-01	0.015929000000000000
1987-01-01	0.015929000000000000
1988-01-01	0.015929000000000000
1989-01-01	0.015929000000000000
1990-01-01	0.015929000000000000
1991-01-01	0.014176000000000000
1992-01-01	0.014889000000000000
1993-01-01	0.017434000000000000
1994-01-01	0.017814000000000000
1995-01-01	0.021122000000000000
1996-01-01	0.010347000000000000
1997-01-01	0.013928000000000000
1998-01-01	0.013732000000000000
1999-01-01	0.012417000000000001
2000-01-01	0.015824000000000000
2001-01-01	0.029035000000000002
2002-01-01	0.027384000000000000
2003-01-01	0.018246000000000002
2004-01-01	0.016065000000000000
2005-01-01	0.019031000000000000
2006-01-01	0.025980000000000000
2007-01-01	0.030650000000000000
2008-01-01	0.034387000000000000
2009-01-01	0.030480000000000000
2010-01-01	0.029552000000000000
2011-01-01	0.034620000000000000
2012-01-01	0.040940000000000000
2013-01-01	0.045849000000000000
2014-01-01	0.076981000000000000
2015-01-01	0.075657000000000000
2016-01-01	0.077394000000000000
2017-01-01	0.091123000000000000