Use this earnings database
THE INTERNATIONAL Federation of Journalists is partnering with
WageIndicator, a global earnings survey that measures the rewards of over 1500 different occupations and 400 industries in over 48 countries around the world to date.
The aim is to assist journalists with bargaining. The IFJ says:
It is important for every journalist to get decent pay for their work. By taking part in this survey, journalists will be able to carry out a salary check by comparing their current salaries with those of their peers, or those in other occupations in a global labour market.
It also collects data for freelance work. The first step is for everyone to complete the anonymous survey (UK version here) to get the most reliable and comprehensive data on earnings.