2012

5.3

2011

6.1

1968

8.1

2008

8.5

2014

8.0

2021

7.1

1978

7.4

1994

8.5

1982

7.5

1997

7.9

2013

8.1

2012

7.4

2017

7.6

2007

7.8

1989

8.3

2015

7.6

1999

8.2

1962

7.0

2016

7.9

2012

6.6