15

14

13

12

11

10

09

08

07

06

6%

5

4

3

2

1

0

US Federal Reserve's key interest rate

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

6%

5

4

3

2

1

0

US Federal Reserve's key interest rate

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

6%

5

4

3

2

1

0

US Federal Reserve's key interest rate