2013

6.7

1952

7.7

2004

6.2

1994

5.9

1976

7.0

1988

6.2

2006

5.6

1999

7.5

1972

7.8

1975

6.8

1987

6.8

1988

6.5

1985

7.3

2008

4.5

1971

7.1

1966

6.8

1950

6.8

1985

6.2

1983

5.5

1973

7.6