1982

5.5

2015

6.9

1968

5.4

2009

7.4

1990

5.2

1988

5.0

1997

8.0

1980

4.5

2001

6.5

1982

7.3

1991

5.9

2003

7.2

2012

8.1

1978

5.0

2004

7.7

2010

7.5

1967

7.8