1960

7.3

2006

5.1

1984

5.7

2009

4.2

2020

7.3

1959

4.0

2008

6.6

1987

6.8

1983

7.2

1957

7.0

1999

6.4

1978

6.3

2009

4.6

1969

7.1

1956

7.1

1944

6.6

1957

6.9

1943

6.9

1966

5.0

1964

6.0