1996

6.4

1990

7.3

1994

6.7

1992

6.8

1994

7.2

1993

7.1

2002

5.7

2000

7.3

1992

6.7

1989

8.3

1981

4.0

1996

6.9

1991

6.0

2000

6.9

1999

6.2