The change from providing a snapshot of information as at the end of a reporting period to a methodology providing cumulative information over an entire calendar year has contributed to the increase in the recorded number of gratis personnel in 2003 and 2004.
从提供报告所述期间终了时的瞬间资料改为提供整个日历年度的积累资料，导致增加了2003年和2004年记录的免费提供人员人数。