1999

7.0

1980

7.8

2006

6.7

1963

6.3

1979

7.3

1993

6.9

1939

7.0

1966

6.5

1992

5.3

1993

7.2

1981

7.1

2016

4.0

2015

6.0

2008

6.6

2006

1.0

2007

6.5

1957

8.3

2006

7.8

2005

6.6

2002

6.6