6.1

2014

5.6

2004

6.7

1986

5.8

1969

5.5

1998

6.2

2004

6.0

2023

6.3

2011

5.1

1988

6.9

2001

9.9

2021

7.8

2010

7.3

1996

7.0

1984

6.7

1976

5.9

1993

5.4

2023

6.3

2013

6.3