Many of the point estimates we provide here are accompanied by 95 percent uncertainty intervals, which imply a 95 percent chance that the true value lies within the given range. Small annual changes in the point estimate may be statistical noise arising from either the modelling process or survey variability and may therefore not reflect a real variation in the numbers relying on different fuels between years. The uncertainty intervals should therefore be considered when assessing changes in the access rate, or in the use of specific fuels, between years.