1996

6.4

1991

3.8

1993

4.2

1994

6.2

1992

3.8

1994

5.8

2002

7.7

2003

7.2

1990

3.0

2005

7.5

1992

5.9

2006

5.1

1984

7.5

1997

7.0

1995

5.1

1984

7.4

1990

7.2

1999

2.8

1989

8.3

2000

6.3

1998

7.1

1991

6.8

2001

6.1

1997

5.9

1992

6.2