1996

6.9

1998

6.2

1989

6.2

2017

6.6

2017

6.5

2020

6.7

1993

6.5

2001

6.8

2019

6.5

2019

6.6

1987

6.0

1975

6.3

1998

6.5

1987

5.3

1980

6.4

1966

6.2

1996

6.5

1988

6.3

2015

6.6

1959

6.1