Very Few Sprouts Came out from Cabbage Seeds; Germination Rate was POOR

I planted seeds of cabbage ten days ago. But I was disappointed by the result. As shown in the photo, I got very few sprouts. Although I want to plant those sprouts in my garden, they are insufficient in number.

So, I went to a different shop today, and bought another package of cabbage seeds. It costed 440 JPY, not cheap. I hope this time I could get more sprouts.