It seems you're asking about a change in the "frequency" of plastic. However, "frequency" is typically used to describe how often something happens, like the frequency of a sound wave or the frequency of a radio signal.

Plastic, on the other hand, is a material. It's possible you are asking about:

* The frequency of plastic production: The amount of plastic produced has been increasing significantly over time. This increase has raised concerns about plastic pollution and its environmental impact.

* The frequency of plastic recycling: There are ongoing efforts to increase the amount of plastic recycled, with varying levels of success depending on the type of plastic and the available infrastructure.

* The frequency of plastic waste: Unfortunately, a large portion of plastic produced ends up in landfills or in the environment, causing pollution and harm to wildlife. This frequency is a pressing global concern.

Please clarify your question: Could you provide more context about what you're interested in? For example, are you asking about the rate of plastic production, the amount of plastic being recycled, or something else entirely?

Once I understand what you're asking, I can provide a more helpful answer.