Which year provided the hardest toughen up challenge? (poll 9957283)

Which year provided the hardest toughen up challenge?

Last year, in 2017 was the hardest.

The hardest was definitely the first year (2013) .

It simply had to be this year (2018).

I think it was 2014.

It was definitely the 2016 course.

For me, it had to be 2015.

See this poll on: https://poll.fm/9957283/embed