Year	Percent
1973-01-01	7.8137000000000000
1974-01-01	6.9704000000000000
1975-01-01	7.6425399999999994
1976-01-01	7.7619200000000000
1977-01-01	7.7697500000000000
1978-01-01	4.8060100000000000
1979-01-01	4.4261300000000010
1980-01-01	3.7841300000000000
1981-01-01	3.5300100000000000
1982-01-01	3.3317600000000000
1983-01-01	2.9751500000000000
1984-01-01	2.4236900000000000
1985-01-01	2.8223400000000000
1986-01-01	2.9560700000000000
1987-01-01	2.8100600000000000
1988-01-01	2.4992099999999997
1989-01-01	3.2886900000000003
1990-01-01	3.7391900000000002
1991-01-01	3.0881400000000000
1992-01-01	3.5491500000000000
1993-01-01	3.7762700000000000
1994-01-01	3.1584000000000000
1995-01-01	3.0812300000000000
1996-01-01	3.3934800000000003
1997-01-01	6.3593800000000010
1998-01-01	9.8834000000000000
1999-01-01	13.1470000000000000
2000-01-01	15.0248000000000000
2001-01-01	15.4968000000000000
2002-01-01	14.6596000000000000
2003-01-01	14.0217000000000000
2004-01-01	14.0704000000000000
2005-01-01	15.1514000000000000
2006-01-01	17.0148000000000000
2007-01-01	19.4404000000000000
2008-01-01	21.2719000000000000
2009-01-01	23.7632000000000000
2010-01-01	23.9024000000000000
2011-01-01	22.8950000000000000
2012-01-01	22.6722000000000000
2013-01-01	24.0583000000000000
2014-01-01	26.4205000000000000
2015-01-01	27.6629000000000000
2016-01-01	27.3262000000000000