1981

5.2

1997

4.5

1999

3.5

1977

6.0

2002

0.0

2002

6.5

1995

0.0

2004

6.6

1996

0.0

1995

0.0

1999

6.8

1998

8.0

2006

1.0

1994

7.1

2015

0.8

1996

0.0

1971

6.4

1970

6.2

1998

7.5

2001

5.9

1993

1.0

1994

3.9

1992

3.4