The inflation rate in Japan between 1968 and today has been 270.31%, which translates into a total increase of ¥270.31. This means that 100 yen in 1968 are equivalent to 370.31 yen in 2019. In other words, the purchasing power of ¥100 in 1968 equals ¥370.31 today. The average annual inflation rate has been 2.55%.