2012

5.8

2004

6.7

1993

6.3

2011

6.6

1991

5.3

2012

5.7

2009

7.4

1980

8.4

1989

5.8

2000

6.8

1983

7.9

2008

7.3

2014

4.6

1984

6.6

1946

8.3

1987

7.1

1971

6.1

1968

6.8

2011

5.6

2007

6.0