1981

1.0

1966

0.0

2005

8.0

1975

5.0

1995

6.9

2016

7.7

1967

5.0

2012

6.9

1999

6.1

1982

6.4

1996

6.6

1974

6.4

1992

7.0

1996

9.5

2007

4.6

1987

0.0