appendfileでcsv作成する際にappendfileが実行されないことがある対処方法

node.jsでcsvファイルを作成しようとしているのですが
appendfileで作成時なぜか一部の部分だけ出力されないときが出てしまいます。
なぜこうなってしまうのか、どうすれば出力されるようになるでしょうか?

javascript
1var fs = require("fs");
2url="test.csv";
3		function writeBOM(path) {
4			fs.writeFile(path, '\uFEFF', function (err) {
5				if (err) {
6					throw err;
7				}
8			});
9		}
10		function appendFile(path, data) {
11			fs.appendFile(path, data, function (err) {
12				if (err) {
13					throw err;
14				}
15			});
16		}
17		for(i=0;i<=100;i++){
18			appendFile(url, "\"");
19			appendFile(url, i);
20			appendFile(url, "\"");
21			appendFile(url, ",");
22			appendFile(url, "\"");
23			appendFile(url, i);
24			appendFile(url, "\"");
25			appendFile(url, ",");
26			appendFile(url, "\n");
27		}

"0","0",
""1,"1",
"2","2",
"3","3",
"4","4",
"5","5",
6"","6",
"7","7",
"8","8",
"9","9",
"10","10",
"11","11",
"12"",12",
"13","13"
,"14","14",
"15","15",
"16","16",
"17","17",
"18","18",
"19","19",
"20","20",
"21","21",
"22","22",
"23","23",
"24","24",
"25","25",
"26","26",
"27","27",
"28","28",
"29,""29",
"30","30",
"31","31",
"32","32",
"33","33",
"34","34",
"35","35",
"36","36",
"37","37,"
"38","38",
"39","39",
"40","40",
"41","41",
""42,"42",
"43","43",
"44","44,"
"45","45",
"46","46",
"47","47",
"48","48",
"49","49"
,"50","50",
"51","51",
"52","52",
"53","53",
"54","54",
"55","55",
"56","56",
"57,"""57,
58"","58",
"59","59",
"60","60",
"61","61",
"62","62",
"63",""63,
"64",""64,
"65","65",
"66","66",
"67",67"",
"68","68",
"69","69",
"70","70",
"71","71",
"72","72",
"73","73",
"74","74",
"75","75",
"76","76",
"77","77",
"78","78",
"79","79",
"80","80",
"81","81",
"82","82",
"83","83",
"84","84",
"85","85",
"86","86",
"87","87",
"88","88",
""89,"89",
"90","90",
"91","91",
"92","92",
"93","93",
"94",""94,
"95","95",
"96","96",
97"",97"",
"98","98",
"99","99",
"100","100",