MOSCOW, June 3 (Reuters) - Russian energy giant Gazprom's average daily natural gas supplies to Europe in May rose by 7.3% from April and 39% year on year, Reuters calculations showed on Monday.

The calculations, based on data from the European gas transmission group Entsog and Gazprom's daily reports on gas transit via Ukraine, showed that average daily pipeline exports to Europe increased to 89.5 million cubic meters (mcm) last month from 83.4 mcm in April and 64.5 mcm in May 2023.

Gazprom's natural gas exports to Europe so far this year have reached about 13 billion cubic meters (bcm).

Europe was once Russia's primary export market but now receives much less Russian gas as a result of the political response to the conflict in Ukraine.

Gazprom has not published its own monthly statistics since the start of 2023. It did not respond to a request for comment.

Russia supplied a total of about 63.8 bcm of gas to Europe by various routes in 2022, according to Gazprom data and Reuters calculations. The volume decreased further, by 55.6%, to 28.3 bcm last year.

Gazprom incurred losses of almost $7 billion in 2023 - its first annual loss since 1999 - owing to falling gas exports to Europe.

At their peak in 2018-2019, annual flows to the region reached between 175 bcm and 180 bcm. (Reporting by Oksana Kobzeva Writing by Vladimir Soldatkin Editing by David Goodman )