1979

5.7

2005

6.5

1999

8.0

1997

9.2

2006

5.0

2007

5.6

1996

6.9

1984

9.5

1990

2.0

2004

6.0

1995

6.3

1991

4.5

1982

8.0

2005

0.0

2015

7.2

1999

2.5

1984

6.3

1991

0.0

1991

0.0

1979

0.0

1983

8.3

1993

7.8

1985

9.0

1981

0.0

1996

8.1

2004

9.0

1987

0.0

1994

6.5