public ActionResult Index(int? year, int? month)
{
int rankingsYear = year.HasValue ? year.Value : DateTime.Today.Year;
int rankingsMonth = month.HasValue ? month.Value : DateTime.Today.Month;
int eligibilityLine = _rankingService.GetEligibilityLine(rankingsMonth, rankingsYear);
var rankings = _rankingService.GetRankings(rankingsMonth, rankingsYear);
return View("Rankings", new RankingsViewModel(rankingsMonth, rankingsYear, eligibilityLine, rankings));
}