Fill empty columns in laravel

I created a hasMany table sorted by Produto :

withthefollowingcode

View:

<tableclass="table table-bordered">
    <thead>
        <tr>
            <td colspan="17">
                <p class="text-center">3. PRODUÇÃO E VENDAS</p>
            </td>
        </tr>
    </thead>
    <tbody>
        <?php $year = $produanteano; ?>
        <tr>
            <td rowspan="2">Produtos </td>
            @foreach($year as $client => $produanteano)
            <td colspan="4">
                <p class="text-center">{{$client}}</p>
                <?php $cont[] = $client ?>
            </td>
            @endforeach
        </tr>
        <tr>
            @foreach($year as $client => $produanteano)
            <td>
                <p>Área (ha)</p>
            </td>
            <td>
                <p>Produção Total</p>
            </td>
            <td>
                <p> R$</p>
            </td>
                <td>
                    <p>Ano</p>
                </td>
            @endforeach
        </tr>
        <?php $produto = $produAnte ?>
        @foreach($produto as $client => $produAnte)
        <tr>
            <td>{{$client}}</td>
            @foreach($produAnte as $teste)

                <td>{!! $teste->area !!}</td>
                <td>{!! $teste->quant !!} 
                    X R$ {!! number_format( $teste->valor,2, ',', '.') !!} 
                    por {!! $teste->medida !!}</td>
                <td>
                  R$ {!! number_format( $teste->quant * $teste->valor,2, ',', '.') !!}
                </td>
                <td>{!! $teste->ano !!}</td>
            @endforeach
        </tr>
        @endforeach
    </tbody>
</table>

Controller:

$produAnte = $projeto->ProduAnt->groupBy('produto');
$produanteano = $projeto->ProduAnt->groupBy('ano');

My question is the following :

There are cases that a particular product had no production in a given year, such as in the image Green Corn and Green beans that did not have a strong and 2015 , 2014 and 2014 values are displayed when the table displays values from 2016 2015 , would you have any way to fill these empty spaces when the item is not registered in a given year?