1999

6.5

1989

5.5

1998

6.1

1996

6.5

6.4

1993

6.4

2014

5.7

1965

6.3

2019

6.7

2011

6.3

1993

6.6

1988

6.2

1971

6.0

2008

6.4

1988

6.5

1966

6.2

2002

6.5

1988

5.7

1986

6.2

1991

6.7