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So, if we look into the cumulative number of exoplanets discovered by year, you can appreciate a huge rise in the number of discovered exoplanets in the years 2014 and 2016:

 Credit to NASA Exoplanet Archive

Also, I don't know if it's by coincidence or not, but the number of publications with the word "exomoon" (a satellite of an exoplanet) seems to increase dramatically by 2015:

enter image description here

Credit to app.dimensions.ai. I might be wrong, but I thought that we would see this rise in the years following 2010, like 2011 or 2012, when the Kepler telescope was beginning this hunt, and in the case of the publications, Kipping (2009a, 2009b) were very important around that time too, so is there any reason of why 2014-2015-2016 seem to be the most important years?

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    $\begingroup$ Have you checked when Kepler released its catalogues of candidate transiting planets...? $\endgroup$ – ProfRob Nov 17 '20 at 8:14
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The big increase is due to the Kepler spacecraft. Kepler is responsible for the majority of the discovered exoplanets (https://exoplanets.nasa.gov/keplerscience/), so its data releases will have a big effect on the planet’s discovered by year. It’s easy to see in the plot attached (From: https://link.springer.com/article/10.1007/s12145-020-00464-7 ) how the years you mentioned match the announcement of discovered exoplanets using Kepler’s and K2 (same spacecraft).

On why it is ~2014 and not 2010/2011/2012, from my understanding that's when the campaigns' data started being released (https://keplerscience.arc.nasa.gov/k2-data-release-notes.html#k2-campaign-1).

enter image description here

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