1961

8.0

1957

7.8

2001

7.4

1998

8.2

1995

7.0

1946

7.8

1942

6.6

1997

7.2

2015

6.0

1983

4.2

2016

6.8

1982

7.6

1966

7.2

1986

6.7

1959

7.2

2002

7.0

1982

7.0

2009

5.4

2001

7.1

2001

6.4