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     * Ligne n°18 : + What are the federal government's sources of revenue?
     * Ligne n°240 : + What are the sources of revenue for state governments?
     * Ligne n°241 : + What are the sources of revenue for local governments?
     * Ligne n°242 : + How have the sources of revenue for state and local government changed over time?
     * Ligne n°272 : The Numbers: What are the federal government’s sources of revenue?
     * Ligne n°276 : Numbers_Figure-1_What-are-fed-govts-sources-of-revenue
     * Ligne n°279 : Numbers_Figure 1_What are fed govt sources of revenue_high
     * Ligne n°281 : * The individual income tax has been the largest single source of federal revenue since 1950, averaging just over 8 percent of GDP.
     * Ligne n°285 : * The remaining sources of revenue have fluctuated less, together claiming between 0.5 and 1.0 percent of GDP since 1950 and standing near the bottom of that range in 2008.
     * Ligne n°286 : * Numbers_Figure-2_What-are-federal-govt-sources-of-revenue
     * Ligne n°288 : Numbers_figure 2_What are federal govt sources of revenue_high
     * Ligne n°289 : * Changes in the shares of the various taxes in total federal revenue reflect these historical shifts. The individual income tax has consistently provided nearly half of total federal revenue since 1950, while other revenue sources have waxed and waned. Excise taxes brought in 19 percent of total revenue in 1950 but only about 3 percent in recent years. The share of revenue coming from the corporate income tax dropped from about one-third in the early 1950s to less than one-sixth in 2008. In contrast, payroll taxes provided more than one-third of revenue in 2008, compared with just one-tenth in the early 1950s.