2009

5.8

2017

7.4

1998

7.7

1988

6.4

1987

7.9

2001

7.2

2010

6.0

1982

7.1

1973

9.2

2003

5.9

1992

6.9

1999

7.0

1981

6.5

1952

6.7

2013

6.1

1994

4.5

1988

7.4

2012

6.1

1989

5.5

1993

6.4