1998

6.0

2006

6.1

1988

6.5

2009

5.1

2010

6.9

2017

6.1

1993

6.1

1992

5.7

2015

6.2

1975

6.4

2017

6.5

1972

4.0

1946

5.8

2008

6.8

2004

6.4

2004

9.9

2012

9.3

2010

6.3

2021

6.1

2006

6.5