Hi. I was wondering if anyone had any graphs, or tables etc... on the past performance of the ASX 200? How long has there been tracking of the ASX 200? Also, I was wondering how ETF's decide on what percentage they invest into varying shares. For example, I saw today that STW's highest holding is with BHP at about 13%, while the second highest holding is down at around 5%. What determines the balance of these funds (ETF's)? How often does the ASX 200 change? How often does STW update their top 200 shares?