[Urgent] Are these expressions natural?

Database tables are decreased from 100 to 50 (takes 50%)
Database tables are decreased from 100 to 50 (takes 50% of total tables)

Which one is natural? I'd like to express that the number of tables decreased takes 50% of total number of tables.

Question

[Urgent] Are these expressions natural?

Database tables are decreased from 100 to 50 (takes 50%)
Database tables are decreased from 100 to 50 (takes 50% of total tables)

Which one is natural? I'd like to express that the number of tables decreased takes 50% of total number of tables.

Answer

I would say something like:

The number of database tables has decreased from 100 to 50 (a 50% reduction).