2006

0.0

1992

7.0

2001

4.6

2005

6.4

1987

7.3

1988

4.8

2008

4.6

2009

6.7

2004

6.1

2002

6.6

1999

5.6

2005

5.5

2008

7.3

1991

6.5

2006

8.0

2020

7.0

1981

0.0

1995

6.6

1957

8.1

1927

7.8