1997

7.2

2002

6.4

2001

7.9

2023

8.0

1994

7.0

2018

5.6

2017

7.0

2025

6.0

2007

6.1

1991

6.2

1990

6.7

1993

5.5

2001

7.1

1996

6.4

1974

4.7

1995

6.3

1985

6.5

2004

5.7

1990

6.1

1966

6.4