2002

6.5

2005

6.3

2005

7.1

2006

5.6

2008

5.4

2007

4.4

2013

5.0

2016

4.5

1979

5.7

1920

5.7

1987

0.0

1991

4.6

1995

6.4

2007

6.0

2000

6.8

2009

6.7

1995

6.2

2008

6.7

2007

5.4

2019

6.3