[
{"codes":[0],"description":"IMMT version just prior to version number being included"},
{"codes":[1],"description":"IMMT-1 (in effect from 2 Nov. 1994)"},
{"codes":[2],"description":"IMMT-2 (in effect from Jan. 2003)"},
{"codes":[3],"description":"IMMT-3 (in effect from Jan. 2007)"},
{"codes":[4],"description":"IMMT-4 (in effect from Jan. 2011)"},
{"codes":[5],"description":"IMMT-5 (in effect from June 2012)"}
]