1992

0.0

1997

6.2

1988

5.0

1998

6.6

1993

0.0

1995

5.9

1989

6.0

1991

5.9

1993

5.4

2000

6.5

1973

7.3

1987

4.9

1995

4.7

1990

5.5

1992

3.5

1996

7.5

2012

7.3

1984

2.5

2013

6.3

1985

1.0