Year	Percent
1973-01-01	9.36105
1974-01-01	8.93256
1975-01-01	9.60341
1976-01-01	10.41620
1977-01-01	13.13650
1978-01-01	16.23030
1979-01-01	17.47460
1980-01-01	15.75340
1981-01-01	14.51790
1982-01-01	16.18630
1983-01-01	16.78080
1984-01-01	16.68250
1985-01-01	17.43740
1986-01-01	17.52120
1987-01-01	17.65000
1988-01-01	19.22520
1989-01-01	18.83580
1990-01-01	17.96150
1991-01-01	14.13050
1992-01-01	9.71461
1993-01-01	9.98025
1994-01-01	11.01530
1995-01-01	19.35120
1996-01-01	27.21200
1997-01-01	25.96960
1998-01-01	26.80660
1999-01-01	27.94880
2000-01-01	27.16020
2001-01-01	29.65240
2002-01-01	30.05090
2003-01-01	29.31800
2004-01-01	28.92280
2005-01-01	31.08290
2006-01-01	33.57290
2007-01-01	33.74110
2008-01-01	32.73910
2009-01-01	30.44250
2010-01-01	29.60740
2011-01-01	33.96920
2012-01-01	36.36090
2013-01-01	39.62440
2014-01-01	39.72250
2015-01-01	43.62670
2016-01-01	56.38950