2001

5.2

2006

7.6

2015

6.2

1968

6.9

2008

6.8

1948

7.3

2009

7.3

1986

6.8

2009

5.8

2013

6.9

1995

6.3

1989

7.0

1965

6.7

1968

6.6

1941

7.3

1997

6.1

1994

5.4

1969

6.6

1969

7.9