2012

5.6

2014

6.4

2013

7.3

1998

6.2

1980

7.3

1965

6.8

2007

7.4

2017

8.0

1992

5.0

1994

7.9

2002

7.1

2017

5.9

2014

6.2

1994

7.6

2017

6.9

2009

7.0

2018

7.3

2013

5.9

1983

6.9

1982

6.2