In which year did Narendra Modi propose to celebrate a day for yoga as ‘International Day of Yoga’ while speaking at the United Nations General Assembly?

The correct answer is 2014.

During his address to the 69th session of the United Nations General Assembly (UNGA) on September 27, 2014, the Prime Minister of India, Narendra Modi, proposed the idea of celebrating an International Day of Yoga. In his speech, he highlighted that yoga is an invaluable gift of India's ancient tradition and embodies unity of mind and body, thought and action.

Following this proposal, India introduced a draft resolution to establish the day, which received overwhelming support. On December 11, 2014, the 193-member UN General Assembly approved the resolution by consensus, co-sponsored by a record 177 countries, declaring June 21 as the International Day of Yoga.