1959

5.8

1963

5.7

1972

6.4

2011

7.0

2013

6.0

1999

7.6

1957

6.9

1956

6.3

1956

5.5

1967

7.0

1965

6.0

2004

5.4

1933

6.2

1934

7.0

1958

7.1

1961

6.7

1949

7.0

1963

5.6

1990

5.0

2009

0.0