1970

7.2

1998

7.4

2002

5.9

1981

3.0

1948

6.7

1991

8.0

2001

6.6

1997

4.6

1994

6.0

1964

7.0

2011

6.8

1999

5.3

1994

5.4

2020

7.3

2017

5.9

1936

0.0

1983

5.0

1998

6.0

2009

4.1

1978

5.7