5.4

1916

7.1

1968

6.7

2003

5.7

2001

5.2

1929

7.5

1998

6.0

1994

6.5

1972

7.3

1989

7.1

2009

4.7

2008

5.8

1990

6.1

2007

4.7

2002

4.6

1977

5.9

1963

6.8

2000

6.2

1958

7.6

1994

5.8