1991

0.0

2005

7.7

1989

6.0

1992

0.0

2002

6.3

1997

6.7

2016

6.0

1993

7.7

2013

0.0

2014

4.3

2007

0.0

2011

7.5

2005

7.5

2000

5.5

1999

5.8

1996

5.7

1992

7.0

2004

7.6

2010

8.2

1999

5.3

2010

6.9