csaDecompressionRatio 1.3.6.1.4.1.9.9.57.1.1.1.1.9

Current decompression ratio, the percentage the data was decompressed. This is an instantaneous value. Decompression ratio of 0% would indicate no decompression, a decompression ratio of 90% could mean 10 octets were decompressed into 100 octets.