2003

6.1

2004

5.6

2007

7.0

2002

7.6

1985

7.7

2005

7.5

2000

7.6

1996

6.4

1995

8.0

2004

7.8

2006

6.1

1987

7.3

1984

7.2

2002

7.4

1987

6.5

1999

7.6