1987

7.0

2009

5.8

2014

6.1

1989

7.4

1992

6.0

1996

5.6

2014

7.4

1992

0.0

2003

6.8

1977

5.3

2008

4.7

1997

7.3

1990

0.0

2011

4.0

2006

7.0

1983

0.0

1982

0.0

1999

3.5

1998

5.5

1989

7.5