Ticker Services began operations in Year 1 and holds long-term investments in available-for-sale debt securities. The year-end cost and fair values for its portfolio of these investments follow. Portfolio of Available-for-Sale Securities Cost Fair Value December 31, Year 1 $ 12,600 $ 16,200 December 31, Year 2 18,200 27,400 December 31, Year 3 21,300 32,000 December 31, Year 4 16,300 21,700 Prepare journal entries to record each year-end fair value adjustment for these securities.