 It is based on the 200 largest ASX listed stocks, which together account for about 82% (as at March 2017) of Australia’s sharemarket capitalisation.The ASX 200 was started on 31 March 2000 with a value of 3133.3, equal to the value of the All Ordinaries at that date.The ASX 200 reached 6,000 points for the first time on Thursday 15 February 2007.