2009

6.8

2004

6.6

1968

6.9

2008

7.4

2008

6.6

2004

6.7

2013

7.6

1986

6.1

1980

5.5

2004

6.1

2002

5.6

2002

6.3

2003

5.1

1971

6.4

2004

6.9

1997

5.7

1985

6.2

2010

6.5

1968

6.7

1999

5.9