2016

6.5

1979

8.3

1997

6.7

2005

7.5

2005

7.8

1986

7.7

1987

7.3

1991

7.6

1973

7.0

2004

6.5

2000

8.1

2006

6.3

1982

7.5

1985

6.7

1985

7.1

1975

8.0

1993

6.6

2006

5.7

1998

6.8

2020

0.0