2014

6.7

2007

6.0

1962

7.0

1954

7.9

1963

7.1

1964

7.4

1967

6.6

1969

6.6

1947

7.6

1971

6.4

1974

6.4

1977

6.8

1980

8.2

1979

6.2

1981

6.5

1951

7.6

1985

6.2

1987

6.5

1997

6.4

1999

8.0