<|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 authors do not own the data. all statistical data concerning r&d units, r&d staff and gerd are available from the statistical yearbook of the central statistical office of poland (gus. rocznik statystyczny. available: http://stat.gov.pl/obszary-tematyczne/roczniki-statystyczne/) and the yearly reports on science and technology (gus. nauka i technika. available: http://stat.gov.pl/obszary-tematyczne/nauka-i-technika-spoleczenstwo-informacyjne/). all statistical data concerning the rankings of r&d units by kbn are available from the public journal of the kbn (dzienniki urzedowe ministra nauki i komitetu badan naukowych, 19982004. avialable: http://kbn.icm.edu.pl/pub/kbn/docs/index_du.html).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>