We have data on income shares from 2000-2011, but not as complete time-series. If you provide us with your e-mail, we can send you an Excel file with available data on income shares. Percentage share of income or consumption is the share that accrues to subgroups of population indicated by deciles or quintiles. The source of this data is World Bank, Development Research Group. Data are based on primary household survey data obtained from government statistical agencies and World Bank country departments. Data for high-income economies are from the Luxembourg Income Study database. For more information and methodology, please see PovcalNet (http://iresearch.worldbank.org/PovcalNet/index.htm). Regards.