Year	Percent
1983-01-01	0.49499799999999994
1984-01-01	1.00992000000000020
1985-01-01	2.39546000000000000
1986-01-01	3.01188000000000000
1987-01-01	3.08909000000000000
1988-01-01	2.12383000000000000
1989-01-01	1.56904000000000000
1990-01-01	1.48724000000000000
1991-01-01	2.08588000000000000
1992-01-01	2.78221000000000000
1993-01-01	3.74264000000000000
1994-01-01	4.10585000000000000
1995-01-01	4.70448000000000000
1996-01-01	6.92139000000000000
1997-01-01	8.58302000000000000
1998-01-01	12.72550000000000000
1999-01-01	9.12477000000000000
2000-01-01	7.81147000000000000
2001-01-01	7.79490000000000000
2002-01-01	7.65886999999999900
2003-01-01	8.10540000000000000
2004-01-01	8.42345000000000000
2005-01-01	8.14940000000000000
2006-01-01	8.72967000000000000
2007-01-01	9.04715000000000000
2008-01-01	10.04860000000000000
2009-01-01	12.93860000000000000
2010-01-01	11.46610000000000000
2011-01-01	11.89700000000000000
2012-01-01	12.82980000000000000
2013-01-01	13.42390000000000000
2014-01-01	12.82580000000000000
2015-01-01	12.28160000000000000
2016-01-01	11.87520000000000000