South Korea's M2 money supply grew at the fastest pace in five years in September due largely to ample liquidity amid a low interest rate trend, the central bank said Wednesday.

The M2 reached 2,230 trillion won ($1.92 trillion) last month, marking a 9.4 percent growth from the same month last year and slightly speeding up from a 9.2 percent on-year gain in the previous month, according to the Bank of Korea.

The September growth is the fastest pace since June 2010, when the figure hit 9.7 percent.

The M2 includes currency in circulation, as well as types of deposits with a maturity of less than two years at lenders and non-banking financial institutions. It does not cover those with a maturity of two years or longer, government bonds or corporate bonds.

The growth country's M2 has been gaining speed in the last few years, up 4.8 percent in 2013, 6.6 percent in 2014 and piercing the 9 percent mark this April.

From a month earlier, the M2 gained 0.7 percent on a seasonally adjusted basis, slowing from a 0.9 percent on-month gain in August. (Yonhap)