You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Himachal_Pradesh

Context:
Census-wise, the state is placed 21st on the population chart, followed by Tripura at 22nd place. Kangra district was top ranked with a population strength of 1,507,223 (21.98%), Mandi district 999,518 (14.58%), Shimla district 813,384 (11.86%), Solan district 576,670 (8.41%), Sirmaur district 530,164 (7.73%), Una district 521,057 (7.60%), Chamba district 518,844 (7.57%), Hamirpur district 454,293 (6.63%), Kullu district 437,474 (6.38%), Bilaspur district 382,056 (5.57%), Kinnaur district 84,298 (1.23%) and Lahaul Spiti 31,528 (0.46%).

Question:
Who was last in population strength?

Lahaul Spiti