1999

5.4

2006

7.0

2008

5.5

1984

6.0

1978

5.9

1947

6.0

1969

6.0

1973

7.4

2001

6.8

1956

6.2

1992

7.4

1944

7.6

2007

7.5

2016

7.3

1951

5.0

2004

4.8

1995

6.5

2002

6.3

1991

7.6

1987

7.1