2003

6.1

2011

7.1

1968

6.9

7.8

2006

7.5

1989

7.5

2010

6.6

1922

7.2

1939

7.5

1972

6.2

1952

7.7

2002

9.5

1928

7.9

1968

7.4

2008

6.1

1937

6.6

1961

7.2

1995

7.6

1955

6.3

1984

7.2