1992

7.4

2019

7.8

2013

5.8

1976

7.1

1973

7.8

1988

6.8

1967

6.0

1995

7.2

2014

6.7

2018

9.1

1985

7.4

2002

7.0

1988

8.4

2009

6.7

2008

6.8

2018

0.0

2001

6.9

1991

7.5

2019

6.7

2019

6.5