For that indicator, Bankscope provides data for Tuvalu from 1997 to 2008. The average value for Tuvalu during that period was 7.9 index points with a minumum of 5.34 index points in 1999 and a maximum of 11.3 index points in 2003.
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Definition: The index captures the probability of default of a country's banking system. Z-score compares the buffer of a country's banking system (capitalization and returns) with the volatility of those returns. It is estimated as (ROA+(equity/assets))/sd(ROA); sd(ROA) is the standard deviation of ROA. ROA, equity, and assets are country-level aggregate figures. Calculated from underlying bank-by-bank unconsolidated data from Bankscope.