UV27 Time Since Last Worked Before 1991
Q0 : 0.2888782<=x<6.432247
Q1 : 6.432247<=x<8.230763
Q2 : 8.230763<=x<9.953918
Q3 : 9.953918<=x<12.33602
Q4 : 12.33602<=x<35.64266
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