More than half of Asia's largest banks saw declines in their return on risk-weighted assets, or RoRWA, for the 12-month period ended June or March compared to a year earlier, according to figures compiled by S&P Global Market Intelligence.

RoRWA is an indication of how well a lender is generating income in terms of the risks it undertakes.

Among the 20 largest banks headquartered in Asia-Pacific with data reported, Australia's Westpac Banking Corp. saw the sharpest decline in RoRWA of 35 basis points, putting its ratio for the 12-month period ended March at 1.93%. The bank saw its net income drop 5.83% year over year while RWAs rose 11.32%.

Hongkong & Shanghai Banking Corp. Ltd. reported the highest RoRWA for the 12 months ended June at 3.40%, up from 3.24% at June 2016. Japan-based Norinchukin Bank, on the other hand, had the lowest return among the banks sampled at 0.62% as of June-end, down 19 basis points.

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