2005

6.9

2012

7.0

2004

7.0

1985

6.1

1988

5.5

1990

7.8

2009

7.3

2021

10.0

1961

6.9

2011

7.1

2017

6.9

2019

6.0

1990

5.9

1982

5.4

2008

7.0

2017

6.0

2009

5.7

2013

6.7

2014

6.8