2000

6.0

2003

6.3

2002

5.6

1990

5.8

1985

7.5

2003

6.2

1995

5.5

2003

6.9

2001

7.1

1987

6.7

1980

8.4

2002

6.6

1999

6.7

1990

5.0

1986

7.7

1997

6.6

1999

6.3

1993

6.7

1996

6.4

1982

7.9