1998

6.5

2003

8.0

1993

6.2

2000

7.7

1995

5.3

1971

8.1

2000

7.6

2002

6.7

1994

7.8

1999

5.7

1990

5.0

2005

8.2

1998

5.4

1997

4.4

1992

6.7

1996

6.9

1995

6.6

1995

6.3

1987

7.8

1999

8.3