1987

7.1

2006

5.9

1988

5.7

1984

5.7

1999

5.5

1997

5.5

1984

5.7

1992

7.6

1992

5.9

2014

6.7

1998

7.9

1982

7.3

1993

10.0

1996

6.8

1977

4.2