<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: the publicly available and unrestricted data sets used in the work can be found at http://databank.worldbank.org/data/download/wdi_excel.zip, http://www.ggdc.net/maddison/maddison-project/data.htm, http://www.bp.com/en/global/corporate/energy-economics/statistical-review-of-world-energy/downloads.html, and http://www.iea.org/publications/freepublications/publication/weo2012_free.pdf.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>