1994

6.2

1984

6.3

1988

5.6

1994

7.8

1991

4.5

2001

3.7

1995

7.3

1979

6.7

2000

8.5

1987

7.7

1986

7.9

2001

7.6

1990

2.3

2002

6.7

1995

4.8