1960

4.2

2008

5.8

1984

6.8

2001

6.3

2013

0.0

1999

6.7

1999

5.5

2008

7.5

1966

6.7

2013

5.5

1952

7.6

1989

6.8

1993

4.5

1990

5.8

2002

6.0

1994

6.1

2008

6.5

1998

7.7

2014

6.0

1983

7.1