Exhibit 9.1 Distribution of Covered Workers Facing Different Cost-Sharing Formulas for Prescription Drug Benefits, 2000-2012 * Distribution is statistically different from distribution for the previous year shown (p<.05). ‡ No statistical tests are conducted between 2003 and 2004 or between 2006 and 2007 due to the addition of a new category. NOTE: Fourth-tier drug cost-sharing information was not obtained prior to 2004. SOURCE: Kaiser/HRET Survey of Employer-Sponsored Health Benefits, 2000- 2012.