LC why do you say that? From my reading of the article the thread title is accurate. This is from the CDC report which is quoted in the article (my boldingfor emphasis):

Of the 118 cases, 47 (40%) resulted in hospitalization. Nine patients had pneumonia, but none had encephalitis and none died. All but one hospitalized patient were unvaccinated. The vaccinated patient reported having received 1 dose of measles-containing vaccine and was hospitalized for observation only. Hospitalization rates were highest among infants and children aged <5 years (52%), but rates also were high among children and adults aged ≥5 years (33%).

Unvaccinated persons accounted for 105 (89%) of the 118 cases. Among the 45 U.S. residents aged 12 months−19 years who acquired measles, 39 (87%) were unvaccinated, including 24 whose parents claimed a religious or personal exemption and eight who missed opportunities for vaccination. Among the 42 U.S. residents aged ≥20 years who acquired measles, 35 (83%) were unvaccinated, including six who declined vaccination because of philosophical objections to vaccination. Of the 33 U.S. residents who were vaccine-eligible and had travelled abroad, 30 were unvaccinated and one had received only 1 of the 2 recommended doses.
So 89% of those who had measles were unvaccinated. So most would agree that 89% is "almost entirely"...