Year	Ratio
1971-01-01	0.118689998984337
1975-01-01	0.104139998555183
1976-01-01	0.117449998855591
1977-01-01	0.121619999408722
1978-01-01	0.137979999184608
1979-01-01	0.134670004248619
1980-01-01	0.130500003695488
1982-01-01	0.125750005245209
1983-01-01	0.141509994864464
1985-01-01	0.152940005064011
1986-01-01	0.150609999895096
1987-01-01	0.153080001473427
1989-01-01	0.158690005540848
1990-01-01	0.151610001921654
1991-01-01	0.158030003309250
1992-01-01	0.159930005669594
1993-01-01	0.177609995007515
1995-01-01	0.175929993391037
1996-01-01	0.203510001301765
1997-01-01	0.242840006947517
1998-01-01	0.253630012273788
1999-01-01	0.469240009784698
2000-01-01	0.479829996824265
2001-01-01	0.502770006656647
2002-01-01	0.502900004386902
2008-01-01	0.462540000677109
2009-01-01	0.417079985141754
2010-01-01	0.412919998168945
2011-01-01	0.424340009689331
2012-01-01	0.392619997262955
2013-01-01	0.415749996900558
2014-01-01	0.416900008916855
2015-01-01	0.418000012636185