2003

7.4

1980

6.6

2003

5.8

1968

7.3

1970

7.1

1979

7.0

2016

7.3

2007

6.1

1962

7.6

1950

5.6

1984

6.0

2007

6.2

2003

6.3

1967

6.5

1998

5.7

2008

7.0

1991

6.3

2007

6.3

1939

7.6

2006

7.1