1987

5.3

1988

6.3

1986

6.2

2017

6.6

2006

6.1

1989

5.5

2005

5.2

2017

6.2

1953

7.2

2016

6.5

2020

5.8

2011

6.3

2001

6.8

2013

6.6

1949

6.2

2016

6.5

1988

6.2

2018

7.1

2012

6.2

2014

6.7