1990

6.2

1989

0.0

1965

8.1

1991

5.2

1983

6.6

1992

6.8

1968

7.5

1958

7.7

1989

8.0

1980

6.8

1970

7.0

1992

4.7

2005

7.0

1995

3.0

1999

5.9

1973

9.0

2007

1.0

2008

5.2

2002

6.1

2006

5.9