2011

9.5

2015

7.4

2014

5.6

2006

5.2

7.8

1987

6.9

1955

7.4

1977

7.6

1974

7.0

1994

7.5

2004

7.1

2008

6.0

2014

6.8

5.8

1988

7.4

1953

6.6

1989

7.3

2002

7.3

1970

6.9

1968

5.0