2015

7.4

7.8

1980

8.4

2013

7.3

2008

8.0

1998

7.5

2007

6.6

2004

5.7

1988

6.4

2011

6.6

2023

6.5

2003

6.6

2008

5.2

2003

7.0

2011

7.3

1980

7.8

2012

5.8

2008

6.6

1989

5.6

2014

4.2