1977

7.2

1989

8.1

1996

7.5

1991

0.0

2002

7.8

1999

4.8

1992

7.0

3.5

1999

6.0

1997

7.5

1979

6.8

2001

6.1

1977

7.5

1983

6.3

1990

5.1

1984

6.7

1979

6.0

2002

6.7

2002

6.1