It is exceedingly dangerous to draw too many conclusions from the data, as figures vary depending on their source. For example, in Appendix 4a one can see that the UK export data varies between 5 and 10 per cent between Esteban and the figures presented to parliament. Numbers from the Company itself also show great disparity with both those previously stated. Care has to be taken as to whether or not the value of bullion is included in export figures. Silver was a major export to China to pay for tea until it was steadily replaced by opium, which came from India and is not therefore accounted for, and by the revenue generated in India by the Country Trade. The fluctuations between successive years also make comparisons over a period of time dangerous. For example, using Appendix 4d, export shipping tonnage rose by 8 per cent between 1793 and 1805, but if one compares 1794 to 1804, the growth is 92 per cent. Where there is sufficient data, moving averages can be used, as in Appendix 4c. Care must also be taken to specify whether or not the data is for the UK (including Ireland), or Great Britain (England, Scotland and Wales).