2009

7.8

2006

6.4

2018

7.1

2001

6.6

2013

6.2

1981

7.9

2005

7.0

1994

8.7

2008

6.9

1999

6.9

1985

8.3

2017

7.2

2010

8.4

1998

6.8

1987

7.3

1941

7.0

2016

6.8

2008

8.1

1990

7.4

2015

6.1