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The vast majority of all of those casualties throughout the years is the poorest rural population not being able to afford wood for heating, so they try to get some from the forests in their areas that nobody lays a claim on. You can explain pretty much every uptick by looking at how well the country's economy is doing.

Another common reason for some of the upticks are natural disasters (most frequently floods or landslides) hitting known minefields, which then makes the position more difficult to assess.

There's also a very particular type of mine that doesn't explode on the spot, but shoots ~1m into the air before exploding and sending shrapnel in a large radius which is by far the most deadly (https://en.wikipedia.org/wiki/PROM-1). The reason I'm mentioning it is that there was one particular incident with 5 casualties at a scrapyard that year. That same mine is also responsible for the only casualty last year, when a 19-yo goat herder tried to get his goats back on the road.