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One Committee member suggested that Treasury needs to do more analysis on its investor base as it has changed substantially over the past twenty years . In the past twenty years , many gay and lesbian dancers have become outspoken about their sexuality and how it affects their creative work . The authors analyze the role of factor accumulation and the efficiency with which these factors were used over the past twenty years in Chile , placing output fluctuations in the context of a simple neoclassical growth model . If in addition you factor in the inequality of society , or you factor in how many parts of the economy are linked to the U.S. and consequently do n't affect people , probably you are seeing levels of consumption in Mexico that have been flat for the past twenty years .