Scheme in 1955. The INPS replaced the former guild funds' capitalization financing for a PAYGO system, and by 1955, would cover 80% of the population. Participation rates in social security among the self-employed would remain among the lowest, however, and the majority evaded the system in subsequent decades. Following President Perón's 1955 overthrow, the 1949 Constitution was rescinded. Article 14-b, however, was reaffirmed by the 1957 Assembly, thus endorsing the continuity of the social security system, among other social and labor law reforms, with the support of most of the nation's political spectrum. A new payments indexation system was enacted by President Arturo Frondizi in 1958. Minimum monthly pensions were set that ranged from 70% (for those retiring at age 60) to 82% (at age 65) of a contributor's real average earnings during the best three years from the last 10 years of employment. This schedule, popularly known in Argentina as the 82% móvil, led to deficits in the INPS by 1962, and to the reduction of payments to below the 82% ratio; resulting lawsuits were curtailed by a 1967 order. The myriad funds in the INPS were reorganized in 1968 into a National Pension System (NPS) with three general funds for private and public employees and the self-employed, respectively. Each of the nation's provinces also maintained pension funds for local and provincial government staff. The 82% ratio was limited to those who contributed for at least 30 years, and in 1973, the latter stipulation was dropped with the caveat that the pension-income ratio would be 70%. The system's principal weakness became the chronically high rates of evasion by contributors. Participation never exceeded half the estimated work force, and those who contributed typically under-reported income; among the self-employed, evasion rates rose to around two-thirds. The system's finances, nevertheless, remained nearly balanced as late as 1978. The dictatorship in power at the time enacted changes that adversely impacted the pension system, however. Indexation of payments was slowed in 1979 to rates well below inflation, and monthly pensions, which remained at 65% of each worker's reported pre-retirement income in 1978, fell to 40% by 1980. The system's revenue framework was also affected by the replacement of employer contributions (15% of employees' wages) for an earmarked share of the value added tax (which was raised). The NPS would be further strained by the 1981 collapse of Economy Minister José Alfredo Martínez de Hoz's