1978

6.3

1996

5.8

1999

0.0

1982

6.0

1986

7.9

1996

4.0

1994

5.5

2006

5.7

1989

6.9

2003

6.8

1987

7.1

1981

0.0

1984

6.0

2013

4.7

1989

6.1