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22. Historical summary (1953-2001) of exploration along the North West Shelf showing by year (A) West Texas Intermediate and US Wellhead prices by US$ in money of the day, (B) Proprietary and speculative 2D seismic activity by line kilometres, (C) Proprietary and speculative 3D seismic activity by square kilometres, (D) Exploration well drilling frequency divided into dry wells, wells with discovered volumes less than 20mmboe and those with discovered volumes greater than 20mmboe, (E) Success rates for exploration drilling by both discoveries les than and greater than 20mmboe, (F) Total oil condensate and gas volumes (by boe) discovered per year, (G) Detailed display of total oil volumes found per year, (H) Average discovery size per successful exploration well by oil, condensate and gas (as boe) volumes, and (I) Average oil discovery volumes found per exploration well.