As the demand increases for statistics and data to measure the impact of the COVID-19 pandemic, we have had to change our data gathering and release practices, focussing efforts on priority analysis and statistics. https://gov.wales/statistics-and-research
The survey estimates are based on the responses that we receive, which are then used to represent all farms. For further information, please refer to the methodology from the statistical release in the weblink
Data reference periods
2007 - 2017
Statistical quality
Please find this information in the related statistical release, as per the given weblink.