2010

0.0

1991

5.7

1990

7.2

1991

6.1

1997

5.0

1992

4.0

1998

6.2

0.0

2002

6.5

2000

6.2

1968

0.0

2011

7.8

2005

0.0

2012

7.0

1993

8.0

2003

5.6