1996

4.9

1978

7.7

1983

6.4

1963

7.9

1985

3.5

1981

6.7

1992

5.1

1995

7.6

1998

6.1

1997

6.0

2000

6.2

2006

7.4

2010

0.0

1993

0.0

2001

7.3