1989

8.1

1970

0.0

2000

6.8

1981

7.0

1976

5.3

2012

6.0

1998

8.1

1972

5.5

1997

7.5

2002

5.8

1994

8.4

1981

0.0

1990

6.0

1990

6.4

2004

8.3