1974

6.0

1960

7.8

1996

7.2

2017

4.0

2001

7.7

2005

7.2

2005

6.5

2007

6.4

1992

5.6

1992

4.3

2005

7.0

2006

6.5

2007

6.0

1998

6.7

1980

1.0

2002

5.2

2006

6.0

2003

7.0

2003

5.5

2016

0.0