private IEnumerable <EtfDisplay> GetAll(DateTime data, bool shorts, bool distributions, bool onlyEtcs = false)
{
int index = 0;
var ranking = onlyEtcs ? _rankingService.GetAllEtcs(data, shorts, distributions) :
_rankingService.GetAll(data, shorts, distributions);
return(ranking.Etfs
.OrderByDescending(e => e.MediaTotRet)
.Select(e => new EtfDisplay(++index, e)));
}