Question: The Republican head of the Congressional NextGen 9-1-1 Caucus has been the U.S. Representative for Illinois's 15 congressional district since what year?

Context paragraphs:
Cedric Richmond: Cedric Levon Richmond (born September 13, 1973) is an American politician in the Democratic Party who has been the U.S. Representative for Louisiana's 2nd congressional district since 2011.  His district includes most of New Orleans.  Since January 3, 2017, Richmond has served as Chairman of the Congressional Black Caucus.

Frederick R. Lehlbach: Frederick Reimold Lehlbach (January 31, 1876 – August 4, 1937) was an American lawyer and politician.  As a Republican, Lehlbach served as the U.S. Representative for New Jersey's 10th congressional district from 1915 to 1933 and as the representative from New Jersey's 12th congressional district from 1933 to 1937.  Lehlbach was also the nephew of Herman Lehlbach, a former U.S. Representative from New Jersey's 6th congressional district who served from 1885 to 1891.

Morgan Griffith: Howard Morgan Griffith (born March 15, 1958) is an American politician who has been the U.S. Representative for Virginia's 9th congressional district since 2011.  He is a member of the Republican Party and the Freedom Caucus.  The district takes in a large swath of southwestern Virginia, including the New River Valley.

John Shimkus: John Mondy Shimkus ( , born February 21, 1958) is the U.S. Representative for Illinois 's 15 congressional district , since 1997.  He is a member of the Republican Party.

Barbara Lee: Barbara Jean Lee (born July 16, 1946) is the U.S. Representative for California 's 13th congressional district , serving East Bay voters from 1998 to 2013 during a time when the region was designated California 's 9 congressional district .  She is a member of the Democratic Party.  She was the first woman to represent the 9th district and is also the first woman to represent the 13th district.  Lee was the Chair of the Congressional Black Caucus and was the Co-Chair of the Congressional Progressive Caucus.  Lee is notable as the only member of either house of Congress to vote against the authorization of use of force following the September 11, 2001 attacks.  This made her a hero among many in the anti-war movement.  Lee has been a vocal critic of the war in Iraq and supports legislation creating a Department of Peace.

Diane Black: Diane Lynn Black ("née" Warren; born January 16, 1951) is an American politician who has been the U.S. Representative for Tennessee 's 6 congressional district since 2011.  The district includes several suburban and rural areas east of Nashville.  She is a member of the Republican Party.  Previously she was a member of the Tennessee Senate for the 18th district, which encompasses Robertson County and part of Sumner County.  She was floor leader of the State Senate Republican Caucus.  She is a candidate in the Republican primaries for the Tennessee gubernatorial election, 2018.

Mary Jo Kilroy: Mary Jo Kilroy (born April 30, 1949) is the former U.S. Representative for Ohio 's 15 congressional district , serving from 2009 until 2011.  She is a member of the Democratic Party from Ohio.  In her first term she introduced a bill to lend $20 million per year to small businesses (HR5322) and an amendment to assign liability to credit reporting agencies.  She also contributed to legislation on executive pay.  She was defeated in her November 2, 2010 re-election bid.  In 2012 she ran in the newly redrawn, Columbus-based 3rd congressional district but lost in the primary.

Congressional NextGen 9-1-1 Caucus: The Congressional NextGen 9-1-1 Caucus, a United States Congress caucus, works to improve the 9-1-1 phone system and emergency response systems.  The caucus is headed by Congressman John Shimkus (R-IL) and Congresswoman Anna Eshoo (D-CA).

John Spratt: John McKee Spratt Jr. (born November 1, 1942) is an American politician who was the U.S. Representative for South Carolina 's 5 congressional district from 1983 to 2011.  He is a member of the Democratic Party.  Spratt was the dean of the South Carolina congressional delegation, chairman of the U.S. House Committee on the Budget, and the second ranking Democrat on the U.S. House Committee on Armed Services, where he served on three subcommittees: Oversight and Investigations, Strategic Forces, and Air and Land Forces.  In addition to his committee work, he co-chaired the Textile Caucus, the Bearing Caucus, and the Nuclear Energy Caucus.  The 5th Congressional District covers all or part of 14 counties in north-central South Carolina.  The largest cities are Rock Hill and Sumter.  On November 2, 2010, he lost to Republican challenger Mick Mulvaney.

Charlie Dent: Charles Wieder Dent (born May 24, 1960) is an American politician who has been the U.S. Representative for Pennsylvania 's 15 congressional district since 2005.  He is a member of the Republican Party.

Supporting paragraphs: Congressional NextGen 9-1-1 Caucus John Shimkus
Answer: 1997