2015

7.9

1999

7.7

2006

6.7

1992

6.5

2019

7.1

1993

6.6

2017

7.1

1973

7.5

2011

7.1

2014

6.7

2015

7.4

2016

7.0

2010

6.8

1998

10.0

1957

7.4

2004

6.2

2004

5.9

2011

7.0

2009

7.6

1992

5.8