As requested by Charlie, below is an updated Graph based upon the recently released data on the monitored workforce. As may be seen, the balance continues to converge. I have included a spreadsheet below the graph with the actual figures.
Of course the trend will continue as the ageing Protestant population retire at an increasing rate and the younger majority Catholic generation enter the workforce.
The spread has closed by an astonishing 12% over a ten year period or 1.2% per year. If that rate is maintained parity will be achieved by 2017. Five years from now. (Correction- Four years and nine days)