1981

6.5

1987

6.5

1989

6.4

2023

5.9

2006

8.0

1991

6.8

1994

6.7

2005

6.3

1988

6.1

2002

6.2

2025

7.5

1985

6.7

1996

5.9

2004

6.5

2016

5.6

2013

7.3

2007

7.4

1969

7.8

1990

6.4

2020

6.2