 Complete the following phrase:  These measures eventually proved insufficient to avoid deflation. Having taken over in August 2013, Governor Mark Carney wrote his first open letter in February 2015 to explain why inflation had fallen below 1 for the first time in the MPCs history. This was followed by deflation of 0.1 in April 2015, the first month of negative CPI growth since the 1960s, and triggering a second letter. As of February 2015, Carney has written five such letters. Following the UKs 