1986

4.7

1997

6.6

1999

7.9

1995

7.4

1989

4.3

2004

6.1

1989

6.9

1992

6.3

1994

7.8

2000

6.8

1995

7.3

1986

5.8

2001

7.6

2000

7.1

1996

6.3

1985

5.0

1999

8.3

1990

6.2

2002

7.3