2007

5.6

1992

4.2

2014

6.0

1996

6.3

1970

7.1

1977

5.8

1994

5.9

1968

7.1

2006

6.7

1982

7.5

1985

6.7

1990

4.1

1984

6.2

1988

7.8

2014

6.8

1997

6.8

1991

5.7

2002

6.7

2007

6.7

2014

6.1