1981

5.0

2021

5.9

2020

5.0

2013

6.8

2011

8.3

1992

7.4

1976

6.6

1996

7.7

1988

6.4

1997

8.3

1979

0.0

1995

5.3

1999

6.7

1982

5.5

1993

8.4

2008

6.0