Development expenses were $6,495,006 for the year ended December 31, 2020, an increase of $3,814,650 or 142.3% from $2,680,356 for 2019. The increase consists of $5,356,749 for payments made to the operator for previously unpaid costs associated with the Hawkwood Development wells offset by $1,542,099 that was primarily due to a decrease in other drilling activity and corresponding limited development expenses during the year ended December 31, 2020 compared to the year ended December 31, 2019.
Excess of revenues over direct operating expenses and lease equipment and development costs. The excess of revenues over direct operating expenses and lease equipment and development costs from the underlying properties was $6,257,784 for the year ended December 31, 2020, a decrease of $9,569,465 or 60.5% from $15,827,249 for the year ended December 31, 2019. The trust’s 80% net profits interest of these totals were $5,006,227 and $12,661,799, respectively. During the year ended December 31, 2020, VOC Brazos released $7,045 during the third quarter and and withheld $7,045 during the fourth quarter, and for the year ended December 31, 2019, VOC Brazos did not withhold or release any dollar amounts due to the Trust from previously established cash reserves for future development, maintenance or operating expenditures, which resulted in income from the net profits interest of $5,006,227 and $12,661,799 for such years, respectively. These amounts were further reduced by a trust holdback for future expenses of $1,181,227 and $846,799 for the years ended December 31, 2020 and 2019, respectively. The increase between 2020 and 2019 included an amount estimated to be sufficient to pay estimated Trust expenses through April 2021. The trustee paid general and administrative expenses of $904,355 for the year ended December 31, 2020, an increase of $23,523 from $880,832 for the year ended December 31, 2019. These factors resulted in distributable income for the year ended December 31, 2020 of $3,825,000, a decrease of $7,990,000 from $11,815,000 for the year ended December 31, 2019.
Comparison of Results of the Trust for the Years Ended December 31, 2019 and 2018
Income from Net Profits Interest. Income from net profits interest is recorded on a modified cash basis when the trust receives net profits interest proceeds from VOC Brazos. Net profits interest proceeds that VOC Brazos remits to the trust are based on the oil and gas production VOC Brazos has received payment for within one month following the end of the most recent fiscal quarter. VOC Brazos receives payment for its crude oil sales generally within 30 days following the month in which it is produced. Income from net profits interest is generally a function of oil and gas gross proceeds, lease operating expenses, production and property taxes and development expenses as follows:
Total oil and natural gas sales. Oil and natural gas sales were $32,951,145 for the year ended December 31, 2019, an increase of $623,229 or 1.9% from $32,327,916 for the year ended December 31, 2018. Revenues are a function of oil and natural gas sales prices and volumes sold. The increase in gross proceeds was due to an increase in oil sales volumes partially offset by a small decrease in gas sales volumes during 2019 compared to 2018. This increase was also partially offset by a decrease in market prices for oil and natural gas sales during 2019 compared to 2018. Oil sales volumes were 570,216 Bbls for the year ended December 31, 2019, an increase of 42,167 Bbls or 8.0% from 528,049 Bbls for the year ended December 31, 2018, while natural gas sales volumes were 330,906 Mcf, a decrease of 76 Mcf from 330,982 Mcf for the year ended December 31, 2018. During the year ended December 31, 2019, the average price for oil decreased 5.2% to $56.11 per Bbl and the average price for natural gas decreased 11.0% to $2.90 per Mcf.
Costs. Lease operating expenses were $12,688,464 for the year ended December 31, 2019, an increase of $206,750 or 1.7% from $12,481,714 for the year ended December 31, 2018. The increase was primarily due to increases in the costs of oilfield goods and services. Production and property taxes were $1,755,076 for the year ended December 31, 2019, a decrease of $318,877 or 15.4% from $2,073,953 for the year ended December 31, 2018. The decrease is primarily due to a $380,540 or 30.6% decrease in property taxes partially offset by an increase of $61,663 or 7.4% in production taxes as a result of higher oil sales volumes. Development expenses were $2,680,356 for the year ended December 31, 2019, an increase of $1,081,486 or 67.6% from $1,598,870 for 2018. The increase was primarily due to an increase in the limited drilling activity and corresponding limited development expenses during the year ended December 31, 2019 compared to the year ended December 31, 2018.
Excess of revenues over direct operating expenses and lease equipment and development costs. The excess of revenues over direct operating expenses and lease equipment and development costs from the underlying properties was $15,827,249 for the year ended December 31, 2019, a decrease of $346,130 or 2.1%