2010

6.6

2016

6.0

1997

5.1

1970

6.9

2001

7.2

1969

7.9

1995

6.3

1984

6.1

1986

6.1

2005

3.7

1994

6.0

1944

7.4

1968

6.4

2006

7.1

1962

7.9

2004

6.2

2017

6.2

2015

6.1

1996

6.6

1978

6.5