1974

7.0

1992

5.0

2017

7.8

2007

6.8

1993

6.4

2009

7.1

2014

6.5

1959

6.1

2000

5.5

2004

6.8

1987

4.5

1997

8.3

1988

6.5

2001

6.2

1964

7.0

1997

7.4

2014

7.7

2011

6.7

1988

6.2

2025

7.1