2008

6.4

1978

8.0

1992

6.5

1995

6.4

1998

6.2

2003

4.0

2008

6.0

2013

10.0

2014

5.0

1992

3.0

1959

7.9

1975

7.5

2002

6.1

2001

7.8

1995

8.0

2005

7.0

1994

7.0

2003

5.8

2006

8.2

2014

4.2