1987

3.7

1997

6.0

2012

4.7

1985

6.6

1983

4.8

1981

6.1

1985

5.0

2001

6.0

2003

6.0

1987

5.8

1985

4.3

1982

4.3

1999

7.0

1982

7.0

1978

7.0

1986

5.7

1993

3.2

1984

5.4

1991

5.9

2006

5.1

1975

0.0

1979

5.5

1985

6.2

1989

5.0

2007

8.2

1989

3.8

1985

5.1