You need to take a video from 1995, 2000, 2005, 2010 and 2015 and count the number of stairs of flip tricks and handrails in each one. Also estimate average ledge and gap height and length. Put this all in line charts with number of stairs, ledge height etc versus time.
This can also be done counting certain tricks (like you counted smiths, feebles and manuals in Menikmati) with the number versus time. Thus proving the popularity of a trick over time. This is of great importance and no time should be wasted.