1957

7.2

1988

6.8

1990

6.5

1992

7.4

1976

7.3

1956

7.1

1959

8.1

2007

5.4

1998

5.2

1969

7.6

1982

5.4

1972

6.2

1963

7.2

1932

6.9

2015

7.1

2014

5.8

2016

6.0

2006

6.8

1975

7.9

2012

5.6