Try:
$("#totalVisitorsCurrentDay").text(totalVisCurrDay);
$("#totalVisitorsPastDay").text(totalVisPasDay+"https://stackoverflow.com/"+(100-(totalVisPasDay*100/totalVisCurrDay)).toFixed(2)+"%");
$("#totalVisitorsPastWeek").text(totalVisPasWeek+"https://stackoverflow.com/"+(100-(totalVisPasWeek*100/totalVisCurrDay)).toFixed(2)+"%");
5
solved Show + or – percentage value for the total displayed