2000

7.4

1956

7.7

2001

7.4

2004

6.6

1997

7.4

2015

7.5

2017

6.2

2007

7.9

1986

7.2

2008

7.6

1998

7.0

2006

6.7

1980

6.6

2015

5.7

1968

6.8

1955

7.8

1995

7.9

1975

7.8

1998

6.9

1999

6.2