Year	Percent
1978-01-01	0.044764000000000000
1979-01-01	0.060648000000000000
1980-01-01	0.072763000000000000
1981-01-01	0.053383000000000010
1982-01-01	0.033212000000000000
1983-01-01	0.026927999999999997
1984-01-01	0.040458999999999995
1985-01-01	0.030537000000000000
1986-01-01	0.028845999999999997
1987-01-01	0.030601000000000000
1988-01-01	0.023992000000000000
1989-01-01	0.034657000000000000
1990-01-01	0.016158000000000002
1991-01-01	0.010078000000000000
1992-01-01	0.006731000000000000
1993-01-01	0.024373000000000000
1994-01-01	0.024239000000000000
1995-01-01	0.024648000000000000
1996-01-01	0.023884000000000000
1997-01-01	0.022434000000000000
1998-01-01	0.022914000000000000
1999-01-01	0.022678999999999998
2000-01-01	0.030381000000000002
2001-01-01	0.070563000000000000
2002-01-01	0.211442000000000020
2003-01-01	0.214301000000000020
2004-01-01	0.189350000000000000
2005-01-01	0.217417999999999970
2006-01-01	0.232474000000000000
2007-01-01	0.210934000000000000
2008-01-01	0.195029000000000000
2009-01-01	0.188765000000000020
2010-01-01	0.152091000000000000
2011-01-01	0.131541000000000020
2012-01-01	0.105779000000000000
2013-01-01	0.096916999999999990
2014-01-01	0.096015000000000000
2015-01-01	0.083133000000000000
2016-01-01	0.097140999999999990
2017-01-01	0.090802000000000000