The following graphs are for inbound and outbound traffic at the ports of Los Angeles and Long Beach in TEUs (TEUs: 20-foot equivalent units or 20-foot-long cargo container).
To remove the strong seasonal component for inbound traffic, the first graph shows the rolling 12 month average.
On a rolling 12 month basis, inbound traffic was up 0.7% compared to the rolling 12 months ending in May. Outbound traffic was up 0.6% compared to the rolling 12 months ending in May.
The 2nd graph is the monthly data (with a strong seasonal pattern for imports).
In general imports have been increasing, and exports have picked up recently.
It is possible that some of the recent increase was an effort to beat the proposed tariffs. We will know in a few months.