2009

7.0

1988

6.5

1994

7.4

2014

4.6

2010

5.9

2009

5.9

2012

5.0

2006

6.8

2000

5.2

1980

6.7

1998

6.1

2003

7.3

2007

5.5

2011

8.1

1989

5.1

1981

5.8

2012

5.5

2001

5.2

2020

7.3

2014

6.9