2004

6.4

2007

5.5

2005

6.9

1993

6.2

2014

8.5

2012

6.2

1974

6.4

2003

6.8

2004

6.1

1991

7.5

6.3

2017

6.9

2015

6.5

1919

6.9

1945

8.1

2011

6.6

1972

7.9

1995

5.2

1990

5.0

2003

6.9