1992

7.4

1993

4.2

1998

4.3

1989

4.4

1985

6.0

1988

4.1

1994

7.6

1986

5.0

1988

3.5

1987

7.3

2005

7.0

1994

5.7

1999

7.2

1989

5.4

1995

4.4

1990

6.0