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" The vested benefits charge is the annual amount required to amortize the unfunded vested benefits over a period of 10 years ( for persons in pay status ) and over a period of 25 years ( for all other plan participants ) . The Telework Exchange Web site calculates the annual amount a worker spends traveling to and from their job , the percentage of after-tax income spent , and the weight of the pollutants produced from a worker 's commute . Annual income or compensation refers to " institutional base salary , " which is the annual amount that the organization pays for the applicant 's appointment , whether the time is spent on research , teaching , patient care , or other activities . " The annual mass balance of Gulkana Glacier correlates better with summer melt than with the spring snowpack , " Nelson said , explaining that " mass balance " is the annual amount of water added to the glacier by precipitation , minus the water lost from the glacier by melting and evaporation . The information used to estimate methane and carbon dioxide emissions from landfills in Illinois is the annual amount of solid waste landfilled and the volume of gas recovered .