Retrieving Values from Single Column

I have realised my mistake and deleted that post. I had also tried a solution as 

Current Total = 
VAR _T = 
    TOPN(
        1,
        FILTER(CaseLoad,CaseLoad[Active Caseload]<>BLANK()),
        MONTH(CaseLoad[Month Year]),DESC)


RETURN
MAXX(_T,CaseLoad[Active Caseload])

Previous Total = 
VAR _T = 
    TOPN(
        2,
        FILTER(CaseLoad,CaseLoad[Active Caseload]<>BLANK()),
        MONTH(CaseLoad[Month Year]),DESC)


VAR _previous_date = MINX(_T,CaseLoad[Month Year])

RETURN
CALCULATE(SUM(CaseLoad[Active Caseload]),CaseLoad[Month Year]=_previous_date)

Is this a right approach.