1970

5.3

1978

4.2

1993

5.0

2017

6.4

2023

10.0

1998

5.0

1988

7.3

2009

6.1

2003

5.5

2006

6.5

2005

6.8

2002

5.5

2000

6.8

2010

4.2

1977

5.2

1999

4.4

1947

7.5

1980

7.8

1976

7.2

2009

6.4