1970

0.0

1968

0.0

1991

6.8

2008

6.3

2007

4.8

1995

5.9

1973

7.5

2006

6.7

2006

0.0

1991

5.5

2004

5.6

1997

6.1

2002

3.0

1959

6.9

2000

6.4

1978

0.0

1999

0.0

1987

0.0

1999

0.0

1997

6.4