Another source of information was statistics from the Icelandic Health Insurance about the number of expansion plates refunded in the years 2009–2013.
Einnig var stuðst við tölulegar upplýsingar frá Sjúkratryggingum Íslands (SÍ) um fjölda þenslugóma sem fengust endurgreiddir á árunum 2009-2013.