1990

6.1

2004

6.7

1982

7.1

1992

5.3

2013

5.7

1972

7.9

1981

6.5

1995

5.6

1990

6.1

1966

7.8

1949

7.5

1952

6.7

1985

6.2

1993

7.3

2012

7.4

2003

7.3

1971

7.0

2006

5.4

2010

5.7

1985

7.0