Biggest year-over-year improvement

For each athlete we take their best total in every year they competed at all, and then compare it with their best result from the previous year they competed (not necessarily the immediately preceding calendar year - if an athlete did not compete in e.g. 2016, the comparison for 2017 goes against their 2015 result).

This shows the biggest "form jumps" in a career, but can also pick up cases of competing in a different age/weight category.