S&P et al... *PIC*
This one goes up from 180 to 300 in 180 trading days(vertical line). 180 to 300 is 120...120 in 180 TD's is .666(insert evil music here).
The inverse of .6666667 is 1.5...so this has been going up at 1.5 price units per time unit.
See if it breaks the 3000 on day 180(Wednesday) or if it happens, some how, to be a top of some significance.