Nonetheless, SDRs have proved to be useful. After initial allocations in 1970-1972, more were issued to increase global liquidity during major international crises: in 1979-1981, in 1997, and, in particular, in 2009, when the largest issue – the equivalent of $250 billion – was made.
尽管如此，SDR仍起着作用。1970—1972年首次分配后又多次在主要国际危机期间增发以提高全球流动性：1979—1981年、1997年、2009年莫不如此，特别是2009年，增发量高达2,500亿美元。