2017

6.9

2004

6.6

1992

7.0

2007

6.1

1988

5.9

2005

6.4

1983

6.2

2004

5.8

2018

6.8

2014

7.0

1976

7.8

1985

7.3

2020

5.6

1991

7.4

1949

6.0

2005

5.3

1966

7.1

2023

7.0

1994

6.3

2008

6.1