2009

5.4

1985

6.2

2014

6.1

1993

8.0

1997

6.5

2001

6.1

1986

7.7

1967

7.3

1984

6.8

1997

5.2

2011

6.7

2002

7.6

1996

4.0

1932

2.0

1955

7.3

1995

6.3

1995

7.2

2015

7.5

1985

6.2

1962

6.8