如何在DateTimeType Forms Symfony 4中仅选择年份

use Symfony\Component\Form\Extension\Core\Type\DateType;
use Symfony\Component\Form\FormBuilderInterface;

class YourFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('year', DateType::class, [
                'widget' => 'choice',
                'format' => 'yyyy',
            ]);
    }
}

{{ form_start(form) }}
    {{ form_row(form.year) }}
{{ form_end(form) }}