Housing affordability has and continues to be the top priority housing issue Vancouverites must resolve. In 1996, a study published by BC Housing revealed that 25% of renter households in Vancouver pay 50% or more of their incomes to rent. The core housing need model, developed by the CMHC, uses a threshold of households spending at least 30% of their income on shelter costs to illuminate households experiencing acute housing affordability needs. "Moving from the 30% shelter cost-to-income ratio (STIR) used in the core housing need model, to a 50% threshold, typically reduces the number of households identified by more than half." In 2001, Statistics Canada published a study using both the 30% and 50% thresholds to identify renters and homeowners facing unaffordable housing costs in Metro Vancouver. This study revealed that 8.1% of homeowners and 27.8% of renters exceeded the 30% threshold, while 4.0% of homeowners and 10.8% of renters exceeded the 50% threshold. More in depth still, this study also found that 18.5% of immigrants living in Vancouver exceeded the 30% threshold and 8.0% exceed the 50% threshold. Only 11.3% and 4.8% of Canadian born households exceeded the 30% and 50% thresholds, respectively.