2014

6.9

2003

6.3

1994

7.8

1997

5.6

2003

4.5

1990

6.1

1992

6.8

2005

7.7

2009

7.5

2010

7.4

2010

6.0

2007

6.6

2012

5.8

2016

5.6

2012

6.2

1999

8.3

1993

8.4