1992

5.9

2003

6.3

1994

6.7

2015

6.0

2005

5.5

1997

6.0

2009

6.6

2003

6.2

2008

6.6

2016

7.2

1991

7.7

2004

6.0

2014

4.1

2011

7.1

2007

5.7

2008

7.4

2011

6.8

1990

6.5

2002

6.9

2002

6.0