1971

7.5

1990

7.5

1993

7.8

1996

7.6

2005

7.1

2020

2.0

1937

5.0

2014

5.0

2008

5.7

2007

4.0

1990

6.7

1938

7.0

2012

10.0

1996

5.9

2007

6.3

2000

5.2

2003

5.3

2009

7.8

1974

6.2

1999

4.8