Costs me 93p ($1.50) to send a 2oz package to the US.
Your mailing rates are now 4 times the price of ours.
In 14 months they have gone up over 100%

Surely in that span of 3 increases your own lightest parcel weight has gone $1.13 --> $1.57 --> $2.09 --> $2.24 or whatever.
Same 100% for you.