Year	Percent
1982-01-01	47.98140000000000
1983-01-01	47.60910000000000
1984-01-01	46.12830000000000
1985-01-01	46.63420000000000
1986-01-01	47.86190000000000
1987-01-01	46.63770000000000
1988-01-01	43.19690000000000
1989-01-01	39.51390000000000
1990-01-01	40.89810000000000
1991-01-01	43.22830000000000
1992-01-01	47.70390000000000
1993-01-01	50.58330000000000
1994-01-01	46.78610000000000
1995-01-01	43.97340000000000
1996-01-01	43.59910000000000
1997-01-01	42.24460000000000
1998-01-01	41.95080000000000
1999-01-01	43.20110000000000
2000-01-01	42.73350000000000
2001-01-01	42.63890000000000
2002-01-01	43.12630000000000
2003-01-01	44.29320000000000
2004-01-01	44.95399999999999
2005-01-01	46.39620000000000
2006-01-01	48.60950000000000
2007-01-01	51.79950000000000
2008-01-01	53.90500000000000
2009-01-01	59.59560000000000
2010-01-01	60.68880000000000
2011-01-01	61.29910000000000
2012-01-01	61.51560000000000
2013-01-01	58.78210000000000
2014-01-01	57.33650000000000
2015-01-01	56.63410000000000
2016-01-01	57.90220000000000