Editor’s Note: Due to a change we made in technology providers, the charts above no longer update with every reader response. The charts reflect a limited set of responses we collected in October 2018.

We based our survey on the work of Dr. Christoph Bartneck, a researcher and AFOL (Adult Fan of Legos). He took 3,655 photos of the Lego minifigures and identified 628 unique expressions. With this database, his team asked participants to choose an emotion from six classic categories rating it in intensity from a scale of one to five.

Bartneck’s study found that over time, happy faces became less common, making way for other many other emotions. Since the 1990s, anger is the fastest growing expression, according to his research. Bartneck’s team concluded the shift comes as more Lego kits embrace themes of conflict, be it “the good knights against the skeleton warriors or the space police against alien criminals.” The faces’ emotions do not always map to good and evil. Hermione Granger can be scared, and Batman’s nemesis, The Joker, can be ecstatic.

Denise Lauritsen, a spokesperson for Lego, says that the “broad variety of minifigure emotions is to help encourage different kinds of role play; adventure, exploration, friendship, action, nurture, storytelling, mission, conflict play and so on…”

In other words, the decline of joyous Legos is by design, and the company is happy about it.