2015

8.1

1988

5.4

2011

7.1

1987

7.4

1989

7.3

1991

5.7

2007

7.3

1939

6.1

2006

5.5

1990

6.5

2016

6.0

1970

6.7

2020

7.0

2014

7.2

2012

6.2

1998

4.8

1993

7.3

2010

7.4

2015

5.0

2019

6.3