1993

6.3

1996

7.5

1991

5.3

1999

7.3

1987

6.4

1986

6.3

1992

4.1

1984

7.2

1995

6.4

1991

6.2

1990

8.5

2004

7.9

1991

7.8

1996

7.3

1994

6.2

1993

7.7

1994

8.4

1995

4.5

1979

6.8

1986

6.1

2001

6.3

1990

7.4

1997

7.8

1996

4.6

1996

6.5

1992

6.7

1980

7.2

1987

5.0

1992

5.2

1984

7.5

1993

5.7

1992

4.0

1997

5.2

1991

5.3

1995

6.5

1983

7.5

1993

6.2

1995

6.5

1999

4.1

1996

7.2

1991

7.8

1999

8.2

1994

6.0

1994

5.9