1996

6.4

1994

6.5

2000

6.7

1992

7.3

1998

0.0

1995

6.6

1984

3.2

2000

8.0

1991

4.6

2000

7.8

1981

6.8

1992

5.3

1986

7.2

2002

6.9

1979

6.0

1985

8.0

2005

5.1

1984

6.2

2009

6.5

1981

5.9

1982

4.5

1986

7.2

1988

7.2

1988

3.0

2006

5.6

1986

6.0

1981

5.3

1978

7.2

1988

5.6

1980

3.7

1992

5.1

1977

6.3

1983

4.8

1979

6.0

1983

7.0

1998

6.9

1994

6.3

1991

6.8

1978

7.5

1997

4.7