Detailed Instructions: You are given a sentence in English. Your job is to translate the English sentence into Polish.
Problem:So, how is it that people went from the 12,000 miles a year to 500 miles?
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Jak to jest, że ludzie zeszli z 20 000 km rocznie do 800 km?