1966

6.9

1995

6.6

1990

9.0

2009

2.0

1995

6.3

1993

7.2

1987

7.0

1971

7.0

1981

0.0

1991

6.0

1985

7.5

1999

4.2

1999

5.4

1967

0.0

1989

0.0