1993

6.9

1998

7.1

2006

5.1

1999

4.3

1986

6.5

1993

6.8

2002

5.6

1998

3.0

1994

7.6

1981

2.5

1989

4.4

2005

6.8

1995

7.9

1998

5.5

2004

4.7

2001

4.1

2003

8.2

2007

3.0

1994

8.2

1998

3.6

2001

2.7

2001

4.3

2002

7.1

2003

4.0

1999

6.1

1987

2.5

1988

6.2

1997

4.6

2001

5.3