1985

7.4

1988

5.7

2009

6.4

1984

3.9

1983

5.0

1989

6.6

1984

6.1

1984

5.4

2004

5.7

2010

7.4

1991

4.4

2005

8.3

1988

0.0

1997

6.6

1979

6.9

1976

4.3

2000

8.5

1990

5.1

2001

8.0

1995

6.5

1985

7.2

1989

1.0

1999

3.8

1999

6.3

1982

6.3

2002

7.2