2020

6.9

2016

7.7

1971

6.5

1951

7.4

2015

6.9

1995

6.5

1990

6.2

2012

7.9

2011

7.1

2017

7.3

2003

5.6

2012

6.4

1970

6.2

2011

7.2

1994

4.4

2011

6.4

2002

6.4

1988

5.2

2018

5.7

2010

6.8