duration_code	duration_text
000	N/A
006	Less than 5 weeks
018	15 weeks and over
031	27 weeks and over
058	52 weeks and over
105	99 weeks and over
106	5 to 10 weeks
107	5 to 14 weeks
108	11 to 14 weeks
109	15 to 26 weeks
110	27 to 51 weeks