SQL would probably be your best option. You could even create a data connection in Excel to pull this. The GL30000 will be journal entries for closed years. GL20000 will be for Open years.
Take a look at the following site for a good start of a view for the GL. You can always modify it to what you need.
victoriayudin.com/.../sql-view-for-all-posted-gl-transactions-in-dynamics-gp