1998

7.3

1960

7.5

1981

7.1

1987

6.4

2003

5.4

1962

7.2

2008

5.8

2001

5.1

2014

6.0

2016

5.4

1998

6.5

1994

6.8

1978

7.4

1993

7.0

1995

5.9

1981

6.8

2001

6.3

1982

5.9

1983

3.9

2013

6.8