1985

6.2

1968

7.1

1971

7.4

1993

7.2

2017

4.8

1998

7.3

2007

6.5

1932

6.0

1940

6.1

2013

0.0

2001

6.0

2009

6.1

2015

6.2

1994

6.4

1993

6.7

1998

5.7

1957

6.8

1974

6.1

1964

6.1

1973

3.1