1999

7.6

1984

7.1

1981

8.1

2003

8.0

2003

7.5

2004

7.0

2006

7.4

1997

8.2

2003

7.2

1997

8.3

2000

7.9

2005

7.8

1996

8.5

1994

8.2

2005

7.3

2008

4.6

2004

7.5

2005

7.2

1977

6.6

2020

0.0