2013

6.3

2017

7.4

2012

7.4

2012

6.8

2004

10.0

1968

6.7

2004

8.0

2002

7.1

1991

6.6

1999

7.3

2004

6.3

2005

8.1

2003

5.4

1977

6.6

1993

7.8

2004

6.8

1960

6.4

2001

6.8

1991

7.4

2006

5.8