1971

8.1

1966

5.8

1961

6.5

1987

7.1

1967

4.2

2005

6.0

1963

9.0

1992

6.2

2017

6.7

2017

4.3

2006

5.2

2009

7.8

1970

4.8

1943

7.7

1992

6.3

2002

6.8

1965

5.7

2001

6.6

1972

7.3

2006

5.0