1999

7.5

1997

6.6

2005

6.7

1958

7.8

1993

0.0

1968

3.2

1971

5.2

1995

7.6

1971

6.8

1993

6.3

1960

7.4

2004

6.2

1970

7.6

2006

6.3

2008

7.8

2004

4.9

2010

6.3

1973

5.8

2009

8.0

2001

6.6