I will explain how this works:
When you got your instrument rating, your insurance costs automatically decreased by $1,000.00. Your new rate is now $200.00.
But, because you will now be a low time IFR pilot, flying in IFR conditions, you go into a higher risk pool, so your rates are automatically increased by $1,000.00, going up to $1,200.00.
When you become a high time, experienced IFR pilot, your rates will automatically decrease by $1,000.00.
But, because you will actually be flying in IFR conditions more often, you will go into a higher risk pool, and your rates will automatically increase $1,000.00 to $1,200.00.
Unless you don't stay proficient, then your rates will go up to $2,400.00.