What % of the sunlight reaching earth is actually used by plants to make sugars?

Only 1 to 2% of the sunlight reaching the earth is used by the plants to make sugars.

The sunlight that reaches the plants are distributed in many ways. Some of the sunlight are reflected by the green leaf, some are absorbed by the structural and non chlorophyll cells and only a small fraction of the sunlight is actually used to carry out photosynthesis.