1953

7.1

2008

7.5

2012

6.1

1969

6.8

1989

7.9

1963

7.0

1994

7.1

1998

5.1

2010

7.0

1985

6.8

2008

4.5

1976

6.9

1956

7.5

1976

7.5

1957

7.9

1965

7.4

1981

7.8

1992

6.3

1972

7.4