Those below the minimum wage are exempt workers such as waiters because they earn tips, and I guarantee you that their real income (on average) is much higher than minimum wage, but data is hard to come by as much of that income is unreported. Thus the 2% figure is a generous over-estimate.
So I'd guess closer to 10% of people make the minimum wage in their jurisdiction (1.9% x 4 + I assume more people make min wage when it's higher)
Very interesting though that 3x as many people make below the min wage as actually earn the "minimum" wage.