Joined MMM Oct 2013 (and started cutting frivolous expenses right away), but didn't start tracking Net Worth until Aug. 2014. I had been investing and saving pretty solidly for about a decade prior to that, but the wife had not. Got her on board after finding MMM and it's made a huge difference (she is now regularly shocked to hear about how much debt her friends have).
Aug 2014
NW = $705,171
Invested assets = $640,573
Sept 1, 2017
NW = $1,290,242
Invested assets = $1,034,894