Let's talk about water chart statistics, but this could be applied to any product.
1) Moving average .. especially for months chart, there are big top downs, moving average (settable on view?) could help a lot.
2) Average .. just display average value per year/month for displayed interval in table
3) Better production granularity .. especially for water, it's painful to read and calculate values. Basically I've minded ~5K per year, but production (from cooling towers with 75% effectivity) is another ~15K. I would like to see how much I've got from groundwater pumps, desalinators, cooling and harvesters
4) Also would like to see net income (but this might be tricky as values can go below zero on y-axis)
5) Recalculate y-axis .. when some stats are disabled, y-axis is not changed, so when enabled stats takes <10% previous max, chart is useless
