According to a recent survey by Consumer Reports,

... almost one-third of Americans said they had experienced a drug price hike in the past year.

Source: "Consumer Reports Finds: Nearly One-Third of Americans Experiencing Price Hikes for Meds; Pricey Pills Impacting Retirement Plans, Family Life, Overall Health," Consumer Reports Press Release, June 21, 2016, http://pressroom.consumerreports.org/pressroom/2016/06/consumer-reports-finds-nearly-one-third-of-americans-experiencing-price-hikes-for-meds-pricey-pills-impacting-retirement-pl.html