The number of pieces of debris with one centimeter diameter or more increased by many degrees when china shot down a satellite to make it's e-snake bigger. A one-centimeter object travelling at orbit speed will strike another object in space like "exploding a hand grenade right next to it". (You've gotta love NewScientist.)
But really, those satellites are small and the owners are constantly on the lookout to prevent their investment being destroyed, currently on average, satellite owners are getting like 1-3 calls a week about debris warnings, whereas a few decades back the figure was more about one every few months.