1996

6.1

1996

6.6

2001

6.5

2006

5.3

2002

6.3

2007

6.5

1990

5.7

1940

5.5

1961

7.3

1994

3.2

2004

7.1

2005

6.7

1980

6.6

1952

6.3

1972

5.0

1991

5.1

1956

6.3

1994

5.1

1963

7.2

1945

7.2