2016

6.1

2004

6.4

2019

6.5

2003

6.8

1980

5.9

2017

6.6

1975

6.9

1966

6.3

1999

8.0

2015

6.5

1995

7.8

2012

5.3

2009

5.9

1933

6.2

1993

6.6

1991

5.7

1966

6.1

2011

6.6

2000

5.1

2001

6.9