1958

8.5

2000

6.4

1992

7.6

1980

8.4

1938

7.1

2011

7.0

1994

6.6

2011

6.0

2009

5.6

1998

7.2

1999

7.4

2001

7.7

1990

7.4

2014

6.2

2012

7.3

2008

6.1

1995

7.3

2005

7.4

2015

7.5

1995

8.0