1971

6.1

1972

7.5

1998

6.9

1994

7.2

1998

7.1

1998

7.4

2008

7.3

1942

5.7

2009

5.3

1939

6.2

1953

8.0

1968

0.0

1954

8.5

1958

7.9

2006

7.6

1982

6.6

2007

6.7

1998

7.2

2003

6.5

1916

7.1