Question: What is the estimated population of the city where journalist Dina Vakil is based?

Context paragraphs:
Whitehorse Manningham Libraries: Whitehorse Manningham Regional Library Corporation provides library services to the City of Manningham and the City of Whitehorse.  City of Manningham covers 114 square kilometres.  The estimated population was 119,442 in 2015.  The languages spoken include Cantonese, Greek, Mandarin, Italian and Arabic.  The City of Whitehorse covers 64 square kilometres.  The estimated population was 163,697 in 2014.  The languages spoken include Cantonese, Mandarin, Greek, Italian, Vietnamese.

Mumbai: Mumbai ( ; also known as Bombay, the official name until 1995) is the capital city of the Indian state of Maharashtra.  It is the most populous city in India with an estimated city population of 18.4 million.  Along with the neighbouring regions of the Mumbai Metropolitan Region, it is second most populous metropolitan area in India, with a population of 21.3 million as of 2016 .  Mumbai lies on the Konkan on the west coast of India and has a deep natural harbour.

Corpus Christi, Texas: The city's population was estimated to be 320,434 in 2014, making it the eighth-most populous city in Texas.  The Corpus Christi metropolitan area had an estimated population of 442,600.  It is also the hub of the six-county Corpus Christi-Kingsville-Alice Combined Statistical Area, with a 2013 estimated population of 516,793.  The Port of Corpus Christi is the fifth-largest in the United States.  The region is served by the Corpus Christi International Airport.

Fort Wayne, Indiana: Fort Wayne is a city in the U.S. state of Indiana and the seat of Allen County.  Located in northeastern Indiana, the city is 18 mi west of the Ohio border and 50 mi south of the Michigan border.  With an estimated population of 264,488 in 2016, Fort Wayne is the 77th most populous city in the United States and the second largest in Indiana, after Indianapolis.  It is the principal city of the Fort Wayne metropolitan area, consisting of Allen, Wells, and Whitley counties, a combined population of 419,453 as of 2011.  In addition to the three core counties, the combined statistical area (CSA) includes Adams, DeKalb, Huntington, Noble, and Steuben counties, with an estimated population of 615,077.

Dina Vakil: Dina Vakil (born 1946) is a journalist based in Mumbai, India.  She served as the first woman resident editor of "The Times of India' "s Bombay edition.  After graduating from Mt Holyoke College, Vakil got her graduate degree from the Columbia School of Journalism.

Bartow, Florida: Bartow ( ) is the county seat of Polk County, Florida, United States.  Founded in 1851 as Fort Blount, the city was renamed in honor of Francis S. Bartow, the first brigade commander to die in combat during the American Civil War.  According to the U.S. Census Bureau 2000 Census, the city had a population of 15,340 and an estimated population of 16,959 in 2009.  It is part of the Lakeland−Winter Haven Metropolitan Statistical Area, which had an estimated population of 584,383 in 2009.  As of 2016, the mayor of Bartow is Trish Pfeiffer.

Ardmore, Oklahoma: Ardmore is a business, cultural, and tourism city in and the county seat of Carter County, Oklahoma, United States.  As of the 2010 census, the city had a population of 24,283, with an estimated population of 24,950 in 2013.  The Ardmore micropolitan statistical area had an estimated population of 48,491 in 2013.  Ardmore is 90 mi from both Oklahoma City and Dallas/Fort Worth, Texas, at the junction of Interstate 35 and U.S. Highway 70, and is generally considered the hub of the ten-county region of South Central Oklahoma, also known by state tourism pamphlets as "Arbuckle Country" and "Lake and Trail Country."  Ardmore is situated about 9 mi south of the Arbuckle Mountains and is located at the eastern margin of the Healdton Basin, one of the most oil-rich regions of the United States.

Bowling Green, Kentucky: Bowling Green is a home rule-class city in and the county seat of Warren County, Kentucky, United States.  As of 2016, its population of 65,234 made it the third most-populous city in the state after Louisville and Lexington; its metropolitan area had an estimated population of 165,732; and the combined statistical area it shares with Glasgow has an estimated population of 218,870.

Milwaukee: Milwaukee ( , ) is the largest city in the state of Wisconsin and the fifth-largest city in the Midwestern United States.  The county seat of Milwaukee County, it is on Lake Michigan's western shore.  Ranked by estimated 2014 population, Milwaukee was the 31st largest city in the United States.  The city's estimated population in 2015 was 600,155.  Milwaukee is the main cultural and economic center of the Milwaukee metropolitan area.  It is also part of the larger Milwaukee-Racine-Waukesha combined statistical area, which had an estimated population of 2,026,243 in the 2010 census.

Las Cruces, New Mexico: Las Cruces, also known as "The City of the Crosses", is the seat of Doña Ana County, New Mexico, United States.  As of the 2010 census the population was 97,618, and in 2015 the estimated population was 101,643, making it the second largest city in the state, after Albuquerque.  Las Cruces is the largest city in both Doña Ana County and southern New Mexico.  The Las Cruces metropolitan area had an estimated population of 213,676 in 2014.  It is the principal city of a metropolitan statistical area which encompasses all of Doña Ana County and is part of the larger El Paso–Las Cruces combined statistical area.

Supporting paragraphs: Dina Vakil Mumbai
Answer: 18.4 million