1973

6.9

1993

7.9

1988

7.7

1994

7.5

1999

7.0

2006

6.6

1994

7.4

2016

4.6

2007

7.2

1975

6.2

2007

6.7

2008

7.6

2014

5.2

2007

6.6

1952

7.8

2007

6.9

2007

6.5

2016

0.0

1998

7.2

1993

6.5