1992

7.4

2003

6.4

2005

6.1

2001

7.5

1996

7.0

1986

7.6

2001

7.4

1973

6.5

1946

7.7

1993

6.5

2000

6.5

2000

6.0

2017

7.8

1939

5.0

2021

5.5

2002

7.5

2017

7.1

1962

7.0

1963

7.1

1965

6.7