Be on the lookout for any changes, ready up-to-date.
The New Currency Act of 1871 did away with these and established the yen, which was defined as 1.
Since that time, however, the yen has greatly decreased in value.
To bring an end to this situation the Bank of Japan was founded in 1882 and given a monopoly on controlling the money supply.
The Bank of Japan maintains a policy of zero to near-zero interest rates and the Japanese government has an extreme anti-inflation policy.
All of these indicators are on this page, see wave-meter up there.