2003

8.0

1996

6.4

2002

7.5

2000

7.4

1995

5.4

1997

4.4

1989

7.2

2005

7.7

2004

4.6

1954

8.5

1992

6.9

2004

7.9

2012

10.0

2008

5.0

1970

0.0

1960

0.0

1999

8.2

2008

2.0

2008

1.5

1981

5.0