A local community has recently implemented a new recycling program aimed at reducing waste. The program encourages residents to separate their recyclables from regular trash, and it provides incentives for those who participate. A community leader stated that based on initial reports, the amount of waste sent to landfills has decreased by 30% in the first three months since the program's launch. The leader concluded that the program is successful and should serve as a model for other communities.
To strengthen the conclusion that the recycling program is successful, which of the following pieces of information would be the most relevant?