The World Top Incomes Database,

… aims to providing convenient on line access to all the existent series. This is an ongoing endeavour, and we will progressively update the base with new observations, as authors extend the series forwards and backwards. Despite the database’s name, we will also add information on the distribution of earnings and the distribution of wealth.

So far the database includes data on twenty-two countries with forty-five further countries under study.  Data can be retrieved by country, date, and variable, and retrieved data can be downloaded as excel spreadsheet.