2006

7.2

2017

4.5

2017

6.7

1997

6.2

1994

4.8

1972

7.9

1982

6.8

2017

6.9

2015

6.7

2004

6.8

1967

6.5

1939

7.5

1946

7.8

1966

7.3

1982

4.4

1923

6.8

1962

7.3

1989

6.2

2008

6.5

1996

5.7