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)));
        }