1989

7.2

1989

5.1

1997

6.8

1985

6.6

2003

7.3

2013

6.1

1988

5.9

1966

7.8

1957

8.1

1999

7.8

1963

7.8

1969

7.6

1959

7.3

2008

6.8

1985

7.7

1987

6.3

1960

6.9

1974

7.9

1954

8.5

1977

6.6