1947

6.5

1950

8.3

1978

7.4

1997

7.5

1956

7.6

1980

7.9

2004

6.6

2004

6.3

1962

7.5

1989

6.8

2014

4.6

1990

5.8

2008

6.5

1949

7.6

2008

1.0

1995

7.3

2003

5.8

1994

3.8

2017

6.9

1939

7.5