2000

4.8

1984

6.5

1994

8.0

1995

6.1

1996

2.7

1993

4.0

1998

5.4

1987

4.5

1994

7.8

1991

5.0

1997

8.0

1989

6.0

1990

6.2

2003

4.1

1987

4.3

1994

6.3

1984

7.2

2007

10.0

1987

6.0

1999

7.5

1990

7.4

1983

6.6

1987

3.8

1976

5.0

1993

7.0

2001

7.0

1991

6.7

1985

6.7

1985

7.2

1998

7.1

1985

6.4

1999

8.2

2002

8.1

2005

7.5