2007

4.1

1999

4.8

1988

4.5

1990

5.8

2004

6.0

1986

5.6

1937

3.0

1937

3.5

2006

5.2

1947

5.5

2014

4.4

1939

0.0

2001

6.9

1939

4.0

1977

5.6

1981

7.4

2008

6.6

1996

6.1

2017

7.4

2020

5.1