1979

5.8

1969

2.5

2018

6.2

2007

6.3

1992

5.4

1983

6.7

1980

5.5

1979

6.7

2023

5.0

1997

6.3

2001

5.1

1996

5.9

2005

4.9

1968

7.6

2006

6.4

2009

6.1

2006

3.0

2016

5.0

2007

6.6

2002

6.6