1992

10.0

2010

7.0

2015

6.5

1993

7.2

2009

7.7

1975

6.6

1977

7.1

2017

5.1

2018

5.8

2006

6.4

2015

6.5

1999

7.8

1988

5.2

1986

7.0

2016

6.5

1994

4.7

1936

8.3

1976

7.7

2014

4.6

1974

7.3