2015

5.7

2001

5.3

2009

6.9

1999

5.0

2014

7.4

2007

5.0

2000

5.8

2003

5.9

1982

6.1

2010

6.2

1992

5.3

1985

6.5

1981

6.2

2004

6.6

1978

3.6

2012

6.4

2014

7.6

2007

6.5

2007

5.6

2004

6.5