I thought YAC died months ago...
Nope, it lost some of it's marketcap, but it's very alive.
YAC got a lot of unique properties that make it hard to compare with other scriptcoins. The network hashrate f.e. is so low because the algorithm gets harder with time. A HD6990 that started with 10Mh/s in May is now well below 50kh/s ...
If you don't know that it would seem that a decline to 1/200th total hashpower was a sign of death, but that 'd be just the normal decrease due to n-changes.