I think it is worth noting that the quality of the data can vary a lot from country to country. On average, governments in countries such as Germany and Norway tend to be more critical and transparent of their own actions while others may try to swipe the issue under the rug of inflate numbers when they deem appropriate. Of course, it doesn't mean there are no truths to the data, it just needs to be taken with a grain of salt even if it is the OECD.