Date

Value

Change, %

2015

55.6

2.21%

2014

54.4

2.34%

2013

53.2

2.46%

2012

51.9

2.60%

2011

50.6

2.74%

2010

49.2

2.81%

2009

47.9

2.88%

2008

46.5

2.96%

2007

45.2

3.03%

2006

43.9

3.17%

2005

42.5

3.35%

2004

41.1