[ADMIN] pgdump and restore results in different sizes DB

Hello Everyone,

I'm moving a postgresql server from one server to another, both running versions 9.4.10
It's a single large database and I'm using pgdump to export and restoring on the new server.

The thing is, on the old server the database size is 81GB, but when I restore on the new server, it decreases to 60GB

List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges | Size | Tablespace | Description
------------+----------+----------+---------+-------+-------------------+-------+------------+-------------
ecidade | postgres | LATIN1 | C | C | | 60 GB | pg_default |

I'm watching the whole process of restoring it and have no errors.
What could I been doing wrong?

Thanks,