6.8

1984

6.3

2009

7.7

1994

6.5

2004

6.0

2013

6.5

2015

7.8

2019

6.4

2013

6.5

2001

6.2

1993

5.5

2002

6.1

2009

6.5

2012

6.2

2012

6.9

2003

5.8

1981

6.2

1997

7.4

2003

6.8

2010

6.7