The Westpac-Melbourne Institute Index of Consumer Sentiment plunged 17.7% to 75.6 in April from 91.9 in March. This is the single biggest monthly decline in the forty seven-year history of the survey, taking the Index beyond GFC lows to levels only seen during the deep recessions of the early 1990s (64.6) and early 1980s (75.5). - Bill Evans, Chief Economist and Spokesperson for Westpac.