1988

6.1

1976

7.5

1996

5.8

1980

7.1

1990

6.0

1999

5.1

2020

7.2

2023

9.2

1969

6.6

1971

7.7

1991

5.7

2021

7.7

1989

7.4

1992

6.3

1975

6.4

1983

6.5

1993

5.8

2005

5.5

1987

5.5

1939

7.5