2007

4.2

2015

4.5

1991

6.3

1940

5.5

1992

6.7

1989

7.1

1938

5.5

2016

6.0

1939

6.0

1951

7.0

1952

6.0

1998

6.8

2009

5.6

1999

6.2

2013

3.0

1978

7.5

2008

5.8

2008

6.3

2000

7.4

2001

5.8