1992

5.5

1990

6.0

1997

9.7

1993

7.8

2004

8.1

2000

6.4

1984

7.1

1995

5.7

1996

6.4

1989

6.8

2007

6.1

2002

1.0

2001

6.3

1993

5.7

1999

5.3