1948

8.0

1988

7.7

1996

7.4

1981

7.2

1997

6.8

1997

6.9

1947

5.9

1969

5.9

1973

7.4

2007

7.5

2007

7.4

1999

6.4

2018

6.7

0.0

2012

4.0

1994

8.3

2004

7.4

1939

6.0

2005

5.5

2000

7.9