How much of published material is available digitally?

Question:

How much of published material is available digitally?

The British Library recently predicted that by 2020 90% of published material will be available digitally. I want to know the figure for now (or a recent figure).

Thanks

Additional Details

7 months ago
Please can you provide the source of your answers? thanks

Best Answer - Chosen by Asker:

A tiny percentage.
I think they were referring to new material, IE published in 2020, not before.