 Sarnia 's population experienced a continual growth from 1961 to 1991 , with a 1991 population of 74 @,@ 376 . In 2001 the population had declined by approximately 3 @,@ 000 . Since 2001 Sarnia 's population has been growing slowly , with a 2011 population count of 72 @,@ 366 . Despite these modest gains , an April 2010 report " Sarnia @-@ Lambton 's Labour Market " states : " Large petrochemical companies are the community 's main economic drivers . Over the recent past , several plants have shutdown , and of those still in operation , increased automation and outsourcing has led to significantly fewer workers . " . These shutdowns and the resulting loss of jobs , and therefore population as workers search for employment elsewhere , will contribute to a general decline shown by one August 2011 study , which shows that the population will decline by 17 % over the next twenty @-@ five years . The Monteith @-@ Brown study cited outlines a plan for restructuring the city based on hybrid zoning areas , which will bring work opportunities closer to the neighborhoods where people live . The City of Sarnia and Lambton County are also implementing an economic development plan with an emphasis on bioindustries and renewable energy . 
 Sarnia <a href='null_genetive' title='1'><mark>'s</mark></a>population experienced a continual growth from 1961 to 1991 , with a 1991 population of 74 @,@ 376 . In 2001 the population <a href='been_done' title='2'><mark>had</mark></a> declined by approximately 3 @,@ 000 . Since 2001 Sarnia <a href='null_genetive' title='3'><mark>'s</mark></a>population <a href='uninflect' title='4'><mark>has</mark></a> been growing slowly , with a 2011 population count of 72 @,@ 366 . Despite these modest gains , an April 2010 report " Sarnia @-@ Lambton <a href='null_genetive' title='5'><mark>'s</mark></a>Labour Market " <a href='uninflect' title='6'><mark>states</mark></a> : " Large petrochemical companies are the community <a href='null_genetive' title='7'><mark>'s</mark></a>main economic drivers . Over the recent past , several plants have shutdown , and of those still in operation , increased automation and outsourcing <a href='been_done' title='8'><mark>has</mark></a> led to significantly fewer workers . " . These shutdowns and the resulting loss of jobs , and therefore population as workers search for employment elsewhere , will contribute to a general decline shown by one August 2011 study , which <a href='uninflect' title='9'><mark>shows</mark></a> that the population will decline by 17 % over the next twenty @-@ five years . The Monteith @-@ Brown study cited outlines a plan for restructuring the city based on hybrid zoning areas , which will bring work opportunities closer to the neighborhoods where people live . The City of Sarnia and Lambton County are also implementing an economic development plan with an emphasis on bioindustries and renewable energy . 
Sarnia  population experienced a continual growth from 1961 to 1991 , with a 1991 population of 74 @,@ 376 . In 2001 the population done declined by approximately 3 @,@ 000 . Since 2001 Sarnia  population have been growing slowly , wid a 2011 population count of 72 @,@ 366 . Despite dem modest gains , an April 2010 report " Sarnia @-@ Lambton  Labour Market " state : " Large petrochemical companies are da community  main economic drivers . ova the recent past , several plants have shutdown , and of those still in operation , increased automation and outsourcing done led to significantly fewer workers . " . Thdesehutdowns and the resulting loss of jobs , and therefore population as workers search for employment elsewhere , will contribute to a general decline shown by one August 2011 study , which show that the population gon decline by 17 % oovathe next twenty @-@ five years . The Monteith @-@ Brown study cited outlines a plan for restructuring tdacity based on hybrid zoning areas , which wgonbring wrk opportunities closer to the neighborhoods where people live . The City of Sarnia and Lambton County are also implementing an economic development plan wwan emphasis on bioindustries and renewable energy .