2008

7.6

2018

8.1

2009

5.9

2010

8.2

2003

7.2

2004

7.3

1987

7.5

2004

7.5

1994

7.0

2007

7.6

1999

6.7

2011

5.9

1987

7.7

2012

7.4

2002

8.1

2016

7.6

1982

7.9

2018

7.8

1962

6.8

2013

7.1