I am in Thailand so I don't have my computer with me. Here are the briefings for September on the North America markets to TPE.

IAH 92.7%

JFK 88.8%
> BR 92.7%
> CI 82.3%

LAX 70.0%
> BR 73.5%
> CI 63.6%
> JX 69.1%

ONT 69.8%

ORD 87.1%

SEA 76.1%
> BR 90.0%
> CI 81.3%
> DL 51.2%
> JX 80.6%

SFO 63.2%
> BR 66.9%
> CI 57.4%
> JX 55.4%
> UA 64.3%

YVR 92.0%
> BR 95.7%
> CI 87.8%

YYZ 95.1%

In a glance it looks like quite some passengers jumped on the SEA wagon from LAX, SFO and ONT (or they simply give the airlines the middle finger that I won't travel or I take another airline with one-stop), some jumped from YVR, ORD and JFK. Not much changed for IAH and YYZ.