Table:
text: World's busiest airports by cargo traffic
2004 final statistics
2004 final statistics
Rank_ Airport Location_ Code_IATA Total_Cargo_Metric_Tonnes _2003_Rank _Change
14. Pudong International Airport Shanghai , Shanghai Shi , China PVG 1642176 17 (+3) +38.1%
15. O`Hare International Airport Chicago , Illinois , United States ORD 1474652 13 (-2) -2.4%
16. Amsterdam Schiphol Airport Amsterdam , North Holland , Netherlands AMS 1467204 15 (-1) +8.4%
17. London Heathrow Airport Hayes , Greater London , United Kingdom LHR 1412033 16 (-1) +8.6%
18. Dubai International Airport Dubai , United Arab Emirates DXB 1169286 18 +22.2%
19. Don Mueang Airport Bangkok , Thailand BKK 1058145 19 +11.3%
20. Newark Liberty International Airport Newark , New Jersey , United States EWR 984838 21 (+1) +2.4%

Question: What is the percentage change at London Heathrow Airport among the world's busiest airports by freight traffic 2004 final statistic?