1966

7.7

1988

6.7

2012

7.8

1965

7.5

2003

7.3

2015

7.9

2012

7.4

1975

7.2

2006

7.5

2016

6.8

1985

7.5

1962

7.2

2015

6.5

2010

6.4

1977

6.8

2013

7.4

1985

7.2

1988

7.5

1960

7.6

1990

6.1