1979

7.7

1987

7.6

1990

8.5

2013

5.7

2021

6.8

2018

5.9

1995

7.4

1997

7.9

1984

7.5

2002

8.0

1976

7.6

1962

8.0

2022

5.7

2023

8.8

1994

7.0

1993

6.3

2006

6.9

1979

8.5

1978

6.0

2018

5.8