1986

5.5

1981

6.3

1999

5.8

2000

6.1

1984

4.1

1997

7.2

1986

5.6

1992

6.8

1984

6.4

1988

3.0

2009

6.9

1998

6.9

1983

4.8

1994

7.8

1980

5.0

1982

0.0

1989

6.0

1991

6.2

1999

5.4

2002

7.6

2005

8.1

1993

3.4

1982

7.5

1990

5.5

1981

6.0

1995

7.8

2000

4.5

1980

6.0

1983

7.5

2001

0.0

1991

6.4

1990

7.4

2005

6.1

1998

6.6

1981

4.0

1997

4.0

1981

3.5

1998

6.8

1994

7.2