pre_text: Marketable Securities Marketable securities consisted of the following (in thousands): We classify our marketable securities as available-for-sale. All marketable securities represent the investment of funds available for current operations, notwithstanding their contractual maturities. Such marketable securities are recorded at fair value and unrealized gains and losses are recorded in Accumulated other comprehensive income (loss) until realized. We typically invest in highly-rated securities with low probabilities of default. Our investment policy requires investments to be rated single A or better, limits the types of acceptable investments, concentration as to security holder and duration of the investment. The gross unrealized gains and losses in fiscal 2019 and 2018 were caused primarily by changes in interest rates. The longer the duration of marketable securities, the more susceptible they are to changes in market interest rates and bond yields. As yields increase, those securities with a lower yield-at-cost show a mark-to-market unrealized loss. We anticipate recovering the full cost of the securities either as market conditions improve, or as the securities mature. Accordingly, we believe that the unrealized losses are not other-than-temporary. When evaluating the investments for otherthan- temporary impairment, we review factors such as the length of time and extent to which fair value has been below the amortized cost basis, current market liquidity, interest rate risk, the financial condition of the issuer, and credit rating downgrades. As of December 28, 2019 and December 29, 2018, gross unrealized losses related to our marketable securities portfolio were not material.
table: December 28, 2019 Amortized Cost   Gains   Losses   Fair Value  
table: U.S. Treasuries $10,458 $11 $— $10,469
table: Commercial paper 3,914 1 (4) 3,911
table: Corporate bond 33,867 68 (7) 33,928
table: Certificate of deposit 3,584 5 — 3,589
table: Agency securities 24,408 38 (16) 24,430
table: $76,231 $123 $(27) $76,327
table: December 29, 2018 Amortized Cost Gains Losses Fair Value
table: U.S. Treasuries $7,997 $1 $(1) $7,997
table: Commercial paper 2,296 — (1) 2,295
table: Corporate bond 30,833 1 (160) 30,674
table: Certificate of deposit 960 — (3) 957
table: Agency securities 8,667 — (59) 8,608
table: $50,753 $2 $(224) $50,531
question: Analyse this data from a financial earnings document. What is the increase/ (decrease) in Amortized Cost of Commercial paper from Fiscal Year Ended December 28, 2019 to December 29, 2018?