1994

6.4

1957

8.1

1961

7.8

6.8

2014

4.6

2012

6.9

1976

6.7

1967

6.1

1999

7.3

1969

7.0

1946

7.8

1982

7.6

1956

7.1

1967

7.5

2010

7.2

1967

7.6

2009

6.7

2015

5.7

1995

7.2

2015

5.5