The OECD has published the Tax Report to G20 Leaders. Please see it in this Link.
The Report describes the continuing fight against tax avoidance and tax evasion as one of the major success stories of the G20, founded on enhanced international co-operation.
The Report highlights progress in each of the areas where OECD has been mandated to boost international co-operation on tax issues. This includes ongoing movement towards greater transparency, principally through the work of the OECD-hosted Global Forum on Transparency and Exchange of Information for Tax Purposes, which now includes 142 members and is managing worldwide implementation of the Common Reporting Standard (CRS) and the first automatic exchanges of financial account information (AEOI), to take place in September 2017.
For further information, you can refer to the relevant OECD webpage (Link).