This variable is present in every CCHS cycle used in cchsflow. In
2007 and 2008, the variable is optional for Newfoundland and Labrador, Nova
Scotia, Ontario, British Columbia and Nunavut.In 2009 and 2010, the variable
is optional for Newfoundland and Labrador, Ontario, and Saskatchewan. In
2011, the variable is optional for Newfoundland and Labrador, Quebec,
Ontario, Manitoba, and Saskatchewan. In 2012, the variable is optional for
Newfoundland and Labrador, Quebec, Ontario, Manitoba, Nunavut, and
Saskatchewan.In 2013, the variable is optional for Quebec, Ontario, Prince
Edward Island, Manitoba, Yukon, and Saskatchewan. In 2014, the variable is
optional for Nunavut, Quebec, Ontario, Prince Edward Island, Manitoba,
Newfoundland and Labrador, Saskatchewan, and British Columbia.