CO2

is produced by burning fossil fuels such as oil and natural gas, and has been connected to global warming. The following table presents the average amounts (in metric tons) of

CO2

emissions for certain years per person in the United States and per person in the rest of the world.

Year	Non-U.S.	U.S.
1997	3.4	20.0
1998	3.3	19.5
1999	3.2	19.6
2000	3.3	20.0
2001	3.3	19.6
2002	3.3	19.6
2003	3.5	19.4
2004	3.7	19.6
2005	3.8	19.5
2006	3.7	19.0

If the non-U.S. emissions differ by 0.2 from one year to the next, by how much would you predict the U.S. emissions to differ? Round the answer to four decimal places.