1965

6.8

1974

7.0

1955

7.2

2018

6.1

2015

6.0

1964

7.0

1992

5.0

2013

8.0

1998

6.2

1937

7.2

1983

6.4

2008

5.7

1989

6.9

1994

5.6

1976

7.3

2017

6.8

2014

6.2

2001

6.1

1982

6.2

1977

7.0