Here's an example of how to sum the numeric values in a Wikipedia HTML table column.

total_deaths.js

// Written for this Wikipedia page on 2015-10-18:
// https://en.wikipedia.org/wiki/List_of_motor_vehicle_deaths_in_U.S._by_year 
var deaths = 0;
$("table.wikitable").first().find("tr").each(
  function() { 
    var deathsCell = $(this).find("td").first().text();
    var pattern = new RegExp("([\d,,]+)[^\d,,]?")
    deathsNum = parseInt(deathsCell.replace(/,/g, ""), 10);
    if(!isNaN(deathsNum)) {
      deaths += deathsNum;
    }
  }
);
console.log(deaths);