HTML table align cells with header from another table - php

Question

I think there is a simple way to align these table cells with the header from another table.
I tried to set the width of every table cell to 6%, this this doesn't align them completely.
This is my table:
https://imgur.com/a/sKUcY
This is how I create the table:
<table class="table table-striped table-bordered turnover_list">
<thead>
<tr class="sorting_1">
<th>Company</th>
<th>Year</th>
<?php
if($_POST['selectall'] == 0) {
$allCompanies = array();
$allCompanies[0] = getCompanyName($_POST['company']);
$allCompanies[1] = getCompanyName($_POST['compare']);
}
if($_POST['frommonth'] != "" && $_POST['tomonth'] != "" && $_POST['fromyear'] != "" && $_POST['toyear'] != "") {
$fromMonth = $_POST['frommonth'];
$toMonth = $_POST['tomonth'];
$fromYear = $_POST['fromyear'];
$toYear = $_POST['toyear'];
} else {
$fromMonth = 0;
$toMonth = 11;
$fromYear = date('Y');
$toYear = date('Y');
}
for($i=$fromMonth; $i<=$toMonth; $i++) {
echo "<th>" . $months[$i] . "</th>";
array_push($selectedMonths, $months[$i]);
}
for($i=$fromYear; $i<=$toYear; $i++) {
array_push($selectedYears, $i);
}
?>
<th>Total</th>
</tr>
</thead>
<?php
foreach($selectedYears as $year) {
$turnoverTotal = 0;
echo "<table class='table table-striped table-bordered turnover_list'>";
echo "<tbody>";
$monthTotal = array("January"=>"0", "February"=>"0", "March"=>"0", "April"=>"0", "May"=>"0", "June"=>"0", "July"=>"0", "August"=>"0", "September"=>"0", "October"=>"0", "November"=>"0", "December"=>"0");
foreach ($allCompanies as $companyName) {
$companyTurnoverTotal = 0;
echo "<tr>";
echo "<td style=''>" . $companyName . "</td>";
echo "<td style=''>" . $year . "</td>";
foreach ($selectedMonths as $month) {
$sql = "SELECT SUM(mob + www) AS 'turnover' FROM turnover WHERE year = '" . $year . "' AND companyID = '" . getCompanyID($companyName) . "' AND month = '" . $month . "'";
$result = mysql_query($sql) or die(mysql_error());
$row = mysql_fetch_assoc($result);
$companyTurnoverMonth = $row['turnover'];
$monthTotal[$month] += $companyTurnoverMonth;
$companyTurnoverTotal += $companyTurnoverMonth;
echo "<td style=''>" . make_format($companyTurnoverMonth) . "</td>";
}
$turnoverTotal += $companyTurnoverTotal;
echo "<td style=' font-weight: bold; background-color:#d3d3d3;'>" . make_format($companyTurnoverTotal) . "</td>";
echo "</tr>";
}
echo "<tr style='font-weight: bold;'>";
echo "<td style='background-color:#d3d3d3;'>Total</td>";
echo "<td style='background-color:#d3d3d3;'>" . $year . "</td>";
foreach($selectedMonths as $month) {
echo "<td style='background-color:#d3d3d3;'>" . make_format($monthTotal[$month]) . "</td>";
}
echo "<td style='background-color:#d3d3d3;'>" . make_format($turnoverTotal) . "</td>";
echo "</tr>";
echo "</tbody>";
echo "</table>";
}
?>
</table>
I created a separate table header, because the user is able to compare companies.
Is there a way to create a table header with multiple other tables (without header) underneath it and have it all aligned with the table header?
This would be my desired result:
https://imgur.com/ZFzZluK