As an incentive to join the Framework Comparison Contract, the Agreement provides that, where an SPM joins within ninety days of the `date of performance` of the Framework Comparison Contract, that SPM is exempt from annual payments to the Accounting States („exempt PMS“) unless the SPM increases its share of the national cigarette market beyond its 1998 market share. i.e. more than 125% of the market share of this 1997 SPM. Where the market share of the exempt PMS increases beyond these relevant historical limits in a given year, the MSA requires the exemptED PMS to make annual payments to the accounting States similar to those of the OPM, but only on the basis of the sales of the PMS, which constitute the increase in the market share of the exempt PMS.  At the time of entry into force of the Master Settlement Agreement, the OPMs together controlled approximately 97% of the domestic cigarette market. In addition to these „Initial Settlement Parties“ (OSPS), the Master Settlement Agreement allows other tobacco companies to join the comparison; A list of these „parties that settle a posteriori“ (SSPs) is maintained by the National Association of Attorneys General.  Since 1998, approximately 41 other tobacco companies have joined the Master Settlement Agreement. These companies, referred to as the Future Participating Producers (SPH), are subject to the restrictions of the Master Settlement Agreement and must make payments to the Member States of settlement, in accordance with the Master Settlement Agreement. Together, MPOs and PMS are designated as Participating Producers (SMPs). Any tobacco company that decides not to participate in the Master Settlement Agreement is designated as a non-participating manufacturer (NPM). .