Investigations of nonprofits, rulings on unclear issues, denials of groups seeking tax-exempt "social welfare" status and staffing have all generally declined over time for the IRS' nonprofit division. But its workload has increased, as has spending by social welfare nonprofits that aren't required to publicly disclose their donors.
Sources: Internal Revenue Service documents and Center for Responsive Politics data.
Note: Data used from IRS documents vary slightly from year to year in some cases. For instance, some data is presented in fiscal years while other data is in calendar years. Election spending is calculated by two-year election cycle.