Question: The current president of the University of Oklahoma approved the Oklahoma Housing Finance Agency's first trust indenture in what year?

Context paragraphs:
Oregon Housing and Community Services Department: The Oregon Housing and Community Services Department (OHCS) is the housing finance agency of the government of the U.S. state of Oregon.  It administers programs providing financing assistance for single family homes, new construction or rehabilitation of multi-family affordable housing developments, and grants and tax credits to promote affordable housing.  Prior to 1991, when the Oregon Legislative Assembly merged the Housing Agency with State Community Services forming OHCS to eliminate duplicative costs and provide better coordination of related activities, financing and service programs were operated separately.

California v. Federal Housing Finance Agency: People of the State of California v. Federal Housing Finance Agency was a California state case in which several California-based plaintiffs filed suit against the Federal Housing Finance Agency (FHFA) for creating a lending rule that impeded the Property Assessed Clean Energy (PACE) program, a program in which property owners repay energy-related property improvements gradually over time (typically 15–20 years) as an addition to their property tax.

David L. Boren: David Lyle Boren (born April 21, 1941) is an American university administrator and politician from the state of Oklahoma.  A member of the Democratic Party, he served as the 21st governor of Oklahoma from 1975 to 1979 and in the United States Senate from 1979 to 1994.  He is currently the 13th president of the University of Oklahoma.  He was the longest serving chairman of the Senate Select Committee on Intelligence.  David Boren officially announced his retirement as president of the University of Oklahoma, effective June 30, 2018.

Home Affordable Refinance Program: The Home Affordable Refinance Program (HARP) is a federal program of the United States, set up by the Federal Housing Finance Agency in March 2009, to help underwater and near-underwater homeowners refinance their mortgages.  Unlike the Home Affordable Modification Program (HAMP), which assists homeowners who are in danger of foreclosure, this program benefits homeowners whose mortgage payments are current, but who cannot refinance due to dropping home prices in the wake of the U.S. housing market correction.

California Housing Finance Agency: The California Housing Finance Agency (CalHFA), established in 1975, is an independent California state agency within the California Department of Housing and Community Development that makes low-rate housing loans through the sale of taxable and tax exempt bonds.

Federal Housing Finance Agency: The Federal Housing Finance Agency (FHFA) is an independent federal agency created as the successor regulatory agency of the Federal Housing Finance Board (FHFB), the Office of Federal Housing Enterprise Oversight (OFHEO), and the U.S. Department of Housing and Urban Development government-sponsored enterprise mission team, absorbing the powers and regulatory authority of both entities, with expanded legal and regulatory authority, including the ability to place government sponsored enterprises (GSEs) into receivership or conservatorship.

Oklahoma Housing Finance Agency: The Oklahoma Housing Finance Agency (OHFA) is a non-profit organization which serves the people of Oklahoma by offering affordable housing resources, including loans and rent assistance.  OHFA was created in 1975 when Governor of Oklahoma David L. Boren approved the agency's first trust indenture.  OHFA is a public trust with the State of Oklahoma as the beneficiary.  The Trust was established to better the housing stock and the housing conditions in the State of Oklahoma and administers the Section 8 housing program for the State.

Vermont Housing Finance Agency: The Vermont Housing Finance Agency (VHFA) is chartered as a private non-profit agency to finance and promote affordable housing opportunities for low- and moderate- income Vermonters.  They are located in Burlington, Vermont.

Nyhomes: Nyhomes is New York State's affordable housing lender.  Its mission is to expand affordable housing opportunities for low- and moderate-income New Yorkers.  “nyhomes” consists of three state agencies: the New York State Housing Finance Agency (HFA), the State of New York Mortgage Agency (SONYMA) and the New York State Affordable Housing Corporation (AHC).

Federal Housing Finance Board: The Federal Housing Finance Board (FHFB) was an independent agency of the United States government established in 1989 in the aftermath of the savings and loan crisis to take over oversight of the Federal Home Loan Banks (FHLBs or FHLBanks) from the Federal Home Loan Bank Board (FHLBB), and was superseded by the Federal Housing Finance Agency (FHFA) in 2008.

Supporting paragraphs: Oklahoma Housing Finance Agency David L. Boren
Answer: 1975