2014

6.5

1971

7.1

1997

7.9

2001

6.4

2010

7.8

1994

6.2

2008

7.3

2004

8.0

1961

7.2

1947

7.5

1995

5.6

2002

6.3

1997

6.2

2002

6.5

1988

5.5

1996

5.8

1980

6.2

2007

6.4

2004

7.3

2002

7.5