1973

0.0

1999

4.1

2006

8.0

2015

3.0

1979

2.0

2003

0.0

1975

5.0

1983

0.0

1997

6.4

2004

5.5

2000

5.6

1998

6.5

1970

0.0

2002

7.0

1999

5.2

1982

0.0