1985

7.7

2013

7.3

1960

8.2

2003

7.1

2016

6.2

2006

6.0

2016

5.2

1974

7.2

2001

6.3

2014

6.5

2006

7.5

2016

6.2

2014

7.2

1998

6.2

1997

6.7

1989

7.3

1989

6.3

1998

9.4

2014

6.8

1989

6.4