2013

7.6

2004

7.8

1990

5.8

2001

6.4

1974

7.4

1977

7.3

2011

6.6

1969

7.6

1957

8.3

2012

6.3

1996

6.9

1977

8.2

2014

8.4

2011

6.4

1967

7.6

2011

5.1

2002

7.5

1994

8.3

2013

6.4

2007

7.9