1985

6.3

2000

7.0

1974

6.3

2001

6.6

2003

8.7

1990

5.7

2004

7.9

1986

6.7

1976

8.0

1998

7.4

1997

8.1

2001

6.0

1999

7.9

1997

0.0

1975

5.0

1976

5.5

1994

5.0

2011

6.3

2015

0.0

1979

0.0