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Acknowledgements

The author would like to express her gratitude to Natalia Uliumdzhieva, Alla Yurova and Anna Suslova for their technical help. The author wish to thank the personnel who have prepared the dataset of NSF UV spectroradiometer network, the ozone and UV database of World Ozone Ultraviolet Radiation Data Centre, TOMS database and the database of CDIAC Data Center, which were used in this study.