刚从国内回来，入境时没有检查护照，去cbp官网也查询不到travel history

cbp官网上显示：

A Form I-94 is needed by all visitors except: U.S. Citizens, returning resident aliens, aliens with immigrant visas, and most Canadian citizens visiting or in transit.

如果没有I-94，怎么证明我离开了美国是否超过一年呢？