1954

6.1

2007

4.5

1939

7.1

2014

6.7

1999

5.2

2002

5.9

1997

6.1

1961

7.7

2007

6.1

2006

6.3

1918

5.0

1991

6.4

2004

5.8

1994

6.1

1986

7.5

1970

4.1

1999

2.0

2003

4.0

2007

6.1

1990

6.4