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Even much more interesting is the number of dependents: https://packagist.org/packages/yiisoft/yii2/dependents https://packagist.org/packages/symfony/symfony/dependents https://packagist.org/packages/laravel/framework/dependents
I think, here there is a problem. You are only looking at symfony / laravel as a framework. Symfony actually have a wide usage outside of the framework. So probably you may want to look into the components, usages and its dependents. One of the popular one is https://packagist.org/packages/symfony/http-foundation/stats .
May be some statistics about Yii and Symfony : https://packagist.org/packages/yiisoft/yii2/stats , https://packagist.org/packages/symfony/symfony/stats will also be interesting.