1999

5.9

2019

6.5

2016

6.1

2014

6.9

1980

5.9

1980

6.4

2006

6.7

1988

6.5

1966

6.1

2023

6.1

1985

6.7

2011

6.6

2006

6.0

1995

5.6

1971

6.0

2003

6.3

1993

6.5

1989

6.2

1993

6.6

1989

5.5