Lotteries are no longer guaranteed cash cows for US state governments, probably because they’re so damn boring.

On Thursday, the Pew Charitable Trusts published data showing that fully half of the 44 states that allow lotteries saw lottery revenue fall between 2014 and 2015. The phenomenon isn’t entirely new, as 21 states reported lottery sales declines between 2013 and 2014.

Lottery participation by US citizens has been steadily decreasing since 1999, when a Gallup poll found that 57% of respondents had purchased a lottery ticket in the past 12 months. That figure fell to 49% in 2016, and keep in mind that there were only 37 lottery states in 1999.

The decline in lottery sales is being blamed on an unholy trinity of ‘jackpot fatigue’ – players opting not to play unless the top prize on offer gets up into the mid-nine-figures or higher – plus increased competition from rival gaming options like casinos and the general disinterest in lotteries shown by the so-called millennial generation.