2014

0.0

2010

8.5

2005

6.8

1990

6.5

1993

6.9

1985

7.4

1988

7.2

2005

4.0

2003

0.0

2004

7.4

2006

4.3

2005

8.0

1985

8.2

1973

6.8

1960

7.4

2003

5.7

1988

7.7

1999

7.7

2002

7.2

1994

5.8