Actually the UBC report is more nuanced.  It generally shows Harcourt and Campbell governments did well while both Clark (Glen Clark and Christy Clark) not as much.  In addition it points out most job growth under the NDP was in the public sector while BC Liberals in the private sector.  Also the BC Business council one shows relative to the rest of Canada BC generally outperformed under the BC Liberals while underperformed under the NDP.  The 90s for pretty much every jurisdiction in the developed world was better than the last decade regardless of government so its how you stack up on relative not absolute issues.