2002

7.2

1992

7.6

1981

6.4

1983

7.1

1994

7.3

1991

4.0

1985

4.1

1986

7.3

1987

6.5

1979

6.8

1987

6.6

1994

8.4

1990

7.0

1991

5.9

1981

6.0