Write some Software

I need a graphical representation using html canvas tags and javascript where the graph values need to be changed dynamically here am giving the link of a demo piece [login to view URL] I need something like that where i need values for just last 4 recent years. The bars in the bar graph should have different color. along with it one more specification is that leaving behind the most recent year overlap the other 3 years such that they get differenciated by their colors and side heading with year one their overlapping area.