1997

6.6

1999

7.5

1970

7.6

1958

7.7

1993

0.0

2005

6.8

1968

3.8

1971

5.2

1971

6.8

1993

6.2

1995

7.6

2006

6.3

2008

7.8

2006

5.9

1960

7.4

2004

6.2

2004

5.0

2010

4.8

2014

6.6

2006

3.0