1961

7.9

1957

8.1

1984

6.7

2008

7.2

2020

6.0

1969

7.6

1966

7.8

1985

7.0

1957

7.2

1959

6.3

2004

6.8

1983

6.8

1956

7.1

1989

6.2

2007

6.1

1986

6.9

1962

7.8

2007

6.9

1990

6.7

1970

6.3