Percentages Based on Total Implementation
Total implementation percentages are the reduction in a nutrient for a specific BMP divided by the total reduction across all BMPs.
For each BMP, the formula for the unweighted percentage is:
   P_T = 100 x (reduction in nitrogen for that BMP) / (reduction in nitrogen for all BMPs).

Percentages Based on 2019-WIP3 Implementation
2019-WIP3 implementation percentages are based on the total implementation percentages and adjusted by two factors. These factors are computed for each sector (agriculture, developed, etc.).
   Factor 1: F₁ = (difference in load from 2020 to WIP3 for a specific sector) / (difference in loads from 2020 to WIP3 across all sectors)
   Factor 2: F₂ = total of unweighted percentages for a specific sector
For each BMP, the formula for the 2019-WIP3 implementation percentage is:
   P_W = (F₁ / F₂) * P_T.