2004

7.3

2010

7.0

2002

6.4

2007

6.4

2004

6.5

2012

5.8

1993

6.4

2007

6.0

1990

7.4

1991

8.1

2011

6.1

2002

7.5

2014

6.2

2008

6.9

1980

8.4

2017

7.2

2010

6.7

2007

7.0

1943

8.2

2016

4.7