1978

5.2

1985

8.3

1989

7.8

1950

7.0

2007

7.1

1997

7.5

2007

7.3

1992

6.5

1992

7.2

1982

8.1

1940

7.1

1984

6.7

2007

7.8

1990

7.5

2010

7.4

2024

7.1

1994

8.5

1972

8.7

1941

7.0

2008

6.4