The Short Version
The specific percentages cited — 58.2% for 1970-71 and "over 71.4%" for 2015-16 — cannot be verified from any official Agriculture Census source in the available evidence. While the broader trend of increasing marginal holdings in Himachal Pradesh is directionally supported, the most authoritative source reports 87.95% for combined small-and-marginal holdings (below 2 hectares), not marginal-only. The claim presents unverified precise figures as established Census data, overstating its evidentiary foundation.