A mix of excellent research tools and starting points.
Think about what you are looking for:
Know your terms. What does "labor participation" mean? There are many glossaries available online, including the U.S. Bureau of Labor Statistics Glossary.
Think about who is most likely to produce the data you are search for.
Non-government organization, such as the OECD?
A non-profit organization?
A university researcher?
If you already have a table or chart with the data you need, but for a different time period, check the source for notes. Where did that data come from, and is there a more current version?
Data - factual information used as a basis for reasoning, discussion, or calculation. (Merriam-Webster Dictonary online)
Statistics - a collection of quantitative data (Merriam-Webster Dictonary online)
Statistics - The larger definition of statistics is a discipline concerned with the analysis of data and decisioni making based upon data. It can also be used to spot trends or isolate causes. (Southern State Community College, Ohio, Math advising web site)