1998

6.0

1972

6.4

1981

6.5

2006

5.7

1983

4.5

2007

6.5

2006

6.7

1977

6.7

1993

4.8

1995

6.3

2011

5.6

2001

6.1

1979

6.8

1989

6.4

2012

6.3

2018

7.0

1974

7.0

2003

5.8

2005

6.2

2011

7.0