pre_text: 3. MARKETABLE SECURITIES As of December 31, 2019, the Company did not hold any marketable securities.
table: December 31, 2018
table: (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value
table: Municipal bonds $44,802 $13 $(110) $44,705
table: Corporate bonds 48,499 23 (226) 48,296
table: $93,301 $36 $(336) $93,001
question: Analyse this data from a financial earnings document. What is the value of the amortized costs of  the municipal bonds as a percentage of the total amortized cost?