By how much did southern representation in Congress increase between 1782 and 1790?

In contrast, no states south of Pennsylvania abolished slavery. Many of the southern states did go as far as relaxing manumission laws, which removed restrictions on the right of individual owners to free their slaves. Because of these laws, between 1782 and 1790 individual Virginian slave owners freed as many as 10,000 slaves.

does this answer your question?