1976

7.0

2013

6.7

1992

8.2

1995

6.5

1993

6.6

2009

6.1

5.8

2001

6.6

1986

6.1

2020

7.8

2004

8.3

2021

9.0

1990

8.7

2002

5.3

2021

5.8

2023

8.5

1998

9.2

1987

7.2

1998

7.2

1994

7.3