2005

6.6

2005

7.0

1998

6.9

2001

6.2

2003

7.8

2001

3.3

1998

7.7

2006

7.2

2001

6.8

2001

6.5

1990

5.8

1958

6.3

1993

7.9

1999

5.3

2005

6.6

2006

6.8

2005

5.6

2007

6.9

2005

7.5

1992

6.9