2016

7.8

2003

6.5

2006

6.2

2009

7.8

2008

6.5

2003

7.0

1995

5.7

1989

6.0

1982

6.7

1991

7.5

2018

6.7

2014

6.8

2007

5.4

1989

6.3

2001

6.5

1976

4.5

2001

6.4

2000

6.9

1997

6.6

1980

6.3